Use the Conan package manager (#4367)

Introduces a conanfile.py (and a Conan recipe for RocksDB) to enable building the package with Conan, choosing more recent default versions of dependencies. It removes almost all of the CMake build files related to dependencies, and the configurations for Travis CI and GitLab CI. A new set of cross-platform build instructions are written in BUILD.md.

Includes example GitHub Actions workflow for each of Linux, macOS, Windows.

* Test on macos-12

We use the <concepts> library which was not added to Apple Clang until
version 13.1.6. The default Clang on macos-11 (the sometimes current
version of macos-latest) is 13.0.0, and the default Clang on macos-12 is
14.0.0.

Closes #4223.

Builds/CMake/deps/cassandra.cmake

@@ -1,167 +0,0 @@
-if(reporting)
-    find_library(cassandra NAMES cassandra)
-    if(NOT cassandra)
-
-        message("System installed Cassandra cpp driver not found. Will build")
-
-        find_library(zlib NAMES zlib1g-dev zlib-devel zlib z)
-        if(NOT zlib)
-            message("zlib not found. will build")
-            add_library(zlib STATIC IMPORTED GLOBAL)
-            ExternalProject_Add(zlib_src
-                PREFIX ${nih_cache_path}
-                GIT_REPOSITORY https://github.com/madler/zlib.git
-                GIT_TAG v1.2.12
-                INSTALL_COMMAND ""
-                BUILD_BYPRODUCTS <BINARY_DIR>/${ep_lib_prefix}z.a
-                LOG_BUILD TRUE
-                LOG_CONFIGURE TRUE
-                )
-
-
-            ExternalProject_Get_Property (zlib_src SOURCE_DIR)
-            ExternalProject_Get_Property (zlib_src BINARY_DIR)
-            set (zlib_src_SOURCE_DIR "${SOURCE_DIR}")
-            file (MAKE_DIRECTORY ${zlib_src_SOURCE_DIR}/include)
-
-            set_target_properties (zlib PROPERTIES
-                IMPORTED_LOCATION
-                ${BINARY_DIR}/${ep_lib_prefix}z.a
-                INTERFACE_INCLUDE_DIRECTORIES
-                ${SOURCE_DIR}/include)
-            add_dependencies(zlib zlib_src)
-
-            file(TO_CMAKE_PATH "${zlib_src_SOURCE_DIR}" zlib_src_SOURCE_DIR)
-        endif()
-
-
-
-
-        find_library(krb5 NAMES krb5-dev libkrb5-dev)
-
-        if(NOT krb5)
-            message("krb5 not found. will build")
-            add_library(krb5 STATIC IMPORTED GLOBAL)
-            ExternalProject_Add(krb5_src
-                PREFIX ${nih_cache_path}
-                GIT_REPOSITORY https://github.com/krb5/krb5.git
-                GIT_TAG krb5-1.20-final
-                UPDATE_COMMAND ""
-                CONFIGURE_COMMAND autoreconf src && CFLAGS=-fcommon ./src/configure --enable-static --disable-shared > /dev/null
-                BUILD_IN_SOURCE 1
-                BUILD_COMMAND make
-                INSTALL_COMMAND ""
-                BUILD_BYPRODUCTS <SOURCE_DIR>/lib/${ep_lib_prefix}krb5.a
-                LOG_BUILD TRUE
-                )
-
-            ExternalProject_Get_Property (krb5_src SOURCE_DIR)
-            ExternalProject_Get_Property (krb5_src BINARY_DIR)
-            set (krb5_src_SOURCE_DIR "${SOURCE_DIR}")
-            file (MAKE_DIRECTORY ${krb5_src_SOURCE_DIR}/include)
-
-            set_target_properties (krb5 PROPERTIES
-                IMPORTED_LOCATION
-                ${BINARY_DIR}/lib/${ep_lib_prefix}krb5.a
-                INTERFACE_INCLUDE_DIRECTORIES
-                ${SOURCE_DIR}/include)
-            add_dependencies(krb5 krb5_src)
-
-            file(TO_CMAKE_PATH "${krb5_src_SOURCE_DIR}" krb5_src_SOURCE_DIR)
-        endif()
-
-
-        find_library(libuv1 NAMES uv1 libuv1 liubuv1-dev libuv1:amd64)
-
-
-        if(NOT libuv1)
-            message("libuv1 not found, will build")
-            add_library(libuv1 STATIC IMPORTED GLOBAL)
-            ExternalProject_Add(libuv_src
-                PREFIX ${nih_cache_path}
-                GIT_REPOSITORY https://github.com/libuv/libuv.git
-                GIT_TAG v1.44.2
-                INSTALL_COMMAND ""
-                BUILD_BYPRODUCTS <BINARY_DIR>/${ep_lib_prefix}uv_a.a
-                LOG_BUILD TRUE
-                LOG_CONFIGURE TRUE
-                )
-
-            ExternalProject_Get_Property (libuv_src SOURCE_DIR)
-            ExternalProject_Get_Property (libuv_src BINARY_DIR)
-            set (libuv_src_SOURCE_DIR "${SOURCE_DIR}")
-            file (MAKE_DIRECTORY ${libuv_src_SOURCE_DIR}/include)
-
-            set_target_properties (libuv1 PROPERTIES
-                IMPORTED_LOCATION
-                ${BINARY_DIR}/${ep_lib_prefix}uv_a.a
-                INTERFACE_INCLUDE_DIRECTORIES
-                ${SOURCE_DIR}/include)
-            add_dependencies(libuv1 libuv_src)
-
-            file(TO_CMAKE_PATH "${libuv_src_SOURCE_DIR}" libuv_src_SOURCE_DIR)
-        endif()
-
-        add_library (cassandra STATIC IMPORTED GLOBAL)
-        ExternalProject_Add(cassandra_src
-            PREFIX ${nih_cache_path}
-            GIT_REPOSITORY https://github.com/datastax/cpp-driver.git
-            GIT_TAG 2.16.2
-            CMAKE_ARGS
-            -DLIBUV_ROOT_DIR=${BINARY_DIR}
-            -DLIBUV_LIBARY=${BINARY_DIR}/libuv_a.a
-            -DLIBUV_INCLUDE_DIR=${SOURCE_DIR}/include
-            -DCASS_BUILD_STATIC=ON
-            -DCASS_BUILD_SHARED=OFF
-            -DOPENSSL_ROOT_DIR=/opt/local/openssl
-            INSTALL_COMMAND ""
-            BUILD_BYPRODUCTS <BINARY_DIR>/${ep_lib_prefix}cassandra_static.a
-            LOG_BUILD TRUE
-            LOG_CONFIGURE TRUE
-            )
-
-        ExternalProject_Get_Property (cassandra_src SOURCE_DIR)
-        ExternalProject_Get_Property (cassandra_src BINARY_DIR)
-        set (cassandra_src_SOURCE_DIR "${SOURCE_DIR}")
-        file (MAKE_DIRECTORY ${cassandra_src_SOURCE_DIR}/include)
-
-        set_target_properties (cassandra PROPERTIES
-            IMPORTED_LOCATION
-            ${BINARY_DIR}/${ep_lib_prefix}cassandra_static.a
-            INTERFACE_INCLUDE_DIRECTORIES
-            ${SOURCE_DIR}/include)
-        add_dependencies(cassandra cassandra_src)
-
-        if(NOT libuv1)
-            ExternalProject_Add_StepDependencies(cassandra_src build libuv1)
-            target_link_libraries(cassandra INTERFACE libuv1)
-        else()
-            target_link_libraries(cassandra INTERFACE ${libuv1})
-        endif()
-        if(NOT krb5)
-
-            ExternalProject_Add_StepDependencies(cassandra_src build krb5)
-            target_link_libraries(cassandra INTERFACE krb5)
-        else()
-            target_link_libraries(cassandra INTERFACE ${krb5})
-        endif()
-
-        if(NOT zlib)
-            ExternalProject_Add_StepDependencies(cassandra_src build zlib)
-            target_link_libraries(cassandra INTERFACE zlib)
-        else()
-            target_link_libraries(cassandra INTERFACE ${zlib})
-        endif()
-
-        file(TO_CMAKE_PATH "${cassandra_src_SOURCE_DIR}" cassandra_src_SOURCE_DIR)
-        target_link_libraries(ripple_libs INTERFACE cassandra)
-    else()
-        message("Found system installed cassandra cpp driver")
-
-        find_path(cassandra_includes NAMES cassandra.h REQUIRED)
-        target_link_libraries (ripple_libs INTERFACE ${cassandra})
-        target_include_directories(ripple_libs INTERFACE ${cassandra_includes})
-    endif()
-
-    exclude_if_included (cassandra)
-endif()