Modularize cmake build config

Builds/CMake/deps/Lz4.cmake

@@ -0,0 +1,60 @@
+#[===================================================================[
+   NIH dep: lz4
+#]===================================================================]
+
+ExternalProject_Add (lz4
+  PREFIX ${nih_cache_path}
+  GIT_REPOSITORY https://github.com/lz4/lz4.git
+  GIT_TAG v1.8.2
+  SOURCE_SUBDIR contrib/cmake_unofficial
+  CMAKE_ARGS
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:-DCMAKE_VERBOSE_MAKEFILE=ON>
+    -DCMAKE_DEBUG_POSTFIX=_d
+    $<$<NOT:$<BOOL:${is_multiconfig}>>:-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}>
+    -DBUILD_STATIC_LIBS=ON
+    -DBUILD_SHARED_LIBS=OFF
+    $<$<BOOL:${MSVC}>:
+      "-DCMAKE_C_FLAGS=-GR -Gd -fp:precise -FS -MP"
+      "-DCMAKE_C_FLAGS_DEBUG=-MTd"
+      "-DCMAKE_C_FLAGS_RELEASE=-MT"
+    >
+  LOG_BUILD ON
+  LOG_CONFIGURE ON
+  BUILD_COMMAND
+    ${CMAKE_COMMAND}
+    --build .
+    --config $<CONFIG>
+    --target lz4_static
+    $<$<VERSION_GREATER_EQUAL:${CMAKE_VERSION},3.12>:--parallel ${ep_procs}>
+    $<$<BOOL:${is_multiconfig}>:
+      COMMAND
+        ${CMAKE_COMMAND} -E copy
+        <BINARY_DIR>/$<CONFIG>/${ep_lib_prefix}lz4$<$<CONFIG:Debug>:_d>${ep_lib_suffix}
+        <BINARY_DIR>
+      >
+  TEST_COMMAND ""
+  INSTALL_COMMAND ""
+  BUILD_BYPRODUCTS
+    <BINARY_DIR>/${ep_lib_prefix}lz4${ep_lib_suffix}
+    <BINARY_DIR>/${ep_lib_prefix}lz4_d${ep_lib_suffix}
+)
+ExternalProject_Get_Property (lz4 BINARY_DIR)
+ExternalProject_Get_Property (lz4 SOURCE_DIR)
+if (CMAKE_VERBOSE_MAKEFILE)
+  print_ep_logs (lz4)
+endif ()
+add_library (lz4_lib STATIC IMPORTED GLOBAL)
+file (MAKE_DIRECTORY ${SOURCE_DIR}/lz4)
+set_target_properties (lz4_lib PROPERTIES
+  IMPORTED_LOCATION_DEBUG
+    ${BINARY_DIR}/${ep_lib_prefix}lz4_d${ep_lib_suffix}
+  IMPORTED_LOCATION_RELEASE
+    ${BINARY_DIR}/${ep_lib_prefix}lz4${ep_lib_suffix}
+  INTERFACE_INCLUDE_DIRECTORIES
+    ${SOURCE_DIR}/lib)
+add_dependencies (lz4_lib lz4)
+target_link_libraries (ripple_libs INTERFACE lz4_lib)
+exclude_if_included (lz4)
+exclude_if_included (lz4_lib)