move new protocol code into main repo

cmake/Git.cmake

@@ -0,0 +1,26 @@
+find_package(Git)
+if(${PROJECT_NAME}_CHECKOUT_GIT_SUBMODULES)
+    if(Git_FOUND)
+        message(STATUS "Git found, submodule update and init")
+        execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
+                        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                        RESULT_VARIABLE GIT_SUBMOD_RESULT)
+        if(NOT GIT_SUBMOD_RESULT EQUAL "0")
+            message(SEND_ERROR "git submodule update --init --recursive failed with ${GIT_SUBMOD_RESULT}, please checkout submodules. This may result in missing dependencies.")
+        endif()
+    else()
+        message(SEND_ERROR "git required for checking out submodules, but not found. Submodules will not be checked out - this may result in missing dependencies.")
+    endif()
+endif()
+
+if(Git_FOUND)
+    execute_process(
+        COMMAND git log -1 --format=%h
+        WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}
+        OUTPUT_VARIABLE PRJ_GIT_HASH
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+else()
+    message(STATUS "Git not found - the version will not include a git hash.")
+    set(PRJ_GIT_HASH "unknown")
+endif()