Housekeeping (#170)

* Update pull_request_template.md

* strip out unused files

* Update CONTRIBUTING.md

* fix docker

* remove conan stuff

* update license

* update hook directory

* Delete .codecov.yml

* Update .dockerignore

* Update genesis.json

* update validator list example

* Update rippled-standalone.cfg

* Update CONTRIBUTING.md

external/snappy/patches/1.1.9-0004-rtti-by-default.patch

@@ -1,20 +0,0 @@
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -53,8 +53,6 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
-   add_definitions(-D_HAS_EXCEPTIONS=0)
- 
-   # Disable RTTI.
--  string(REGEX REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
--  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
- else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
-   # Use -Wall for clang and gcc.
-   if(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")
-@@ -78,8 +76,6 @@ endif()
-   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
- 
-   # Disable RTTI.
--  string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
--  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
- endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
- 
- # BUILD_SHARED_LIBS is a standard CMake variable, but we declare it here to make