Adding Acts extensions

Adding Acts extensions to detectors

docs/CMakeLists.txt

+# from https://devblogs.microsoft.com/cppblog/clear-functional-c-documentation-with-sphinx-breathe-doxygen-cmake/ 
+find_package(Doxygen REQUIRED)
+
+# Find all the public headers
+get_target_property(CAT_CUTIFIER_PUBLIC_HEADER_DIR CatCutifier INTERFACE_INCLUDE_DIRECTORIES)
+file(GLOB_RECURSE CAT_CUTIFIER_PUBLIC_HEADERS ${CAT_CUTIFIER_PUBLIC_HEADER_DIR}/*.h)
+
+set(DOXYGEN_INPUT_DIR ${PROJECT_SOURCE_DIR}/CatCutifier)
+set(DOXYGEN_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/docs/doxygen)
+set(DOXYGEN_INDEX_FILE ${DOXYGEN_OUTPUT_DIR}/html/index.html)
+set(DOXYFILE_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in)
+set(DOXYFILE_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)
+
+#Replace variables inside @@ with the current values
+configure_file(${DOXYFILE_IN} ${DOXYFILE_OUT} @ONLY)
+
+file(MAKE_DIRECTORY ${DOXYGEN_OUTPUT_DIR}) #Doxygen won't create this for us
+add_custom_command(OUTPUT ${DOXYGEN_INDEX_FILE}
+                   DEPENDS ${CAT_CUTIFIER_PUBLIC_HEADERS}
+                   COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYFILE_OUT}
+                   MAIN_DEPENDENCY ${DOXYFILE_OUT} ${DOXYFILE_IN}
+                   COMMENT "Generating docs")
+
+add_custom_target(Doxygen ALL DEPENDS ${DOXYGEN_INDEX_FILE})