Added Doxygen rendering theme

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "config/doxygen-awesome"]
+	path = config/doxygen-awesome
+	url = [email protected]:jothepro/doxygen-awesome-css.git

CMakeLists.txt

@@ -9,9 +9,9 @@ execute_process(COMMAND git rev-parse --short HEAD
 )
 file(STRINGS "version" PROJECT_VERSION)
 if(CMAKE_BUILD_TYPE STREQUAL "Release")
-set(PROJECT_VERSION "${PROJECT_VERSION}")
+    set(PROJECT_VERSION "${PROJECT_VERSION}")
 else(CMAKE_BUILD_TYPE STREQUAL "Release")
-set(PROJECT_VERSION "${PROJECT_VERSION}~dev_${COMMIT_ID}")
+    set(PROJECT_VERSION "${PROJECT_VERSION}~dev_${COMMIT_ID}")
 endif(CMAKE_BUILD_TYPE STREQUAL "Release")
 message(STATUS "Building version ${PROJECT_VERSION}")
 configure_file(config/version.h.in
@@ -109,3 +109,5 @@ if(BUILD_DOCS)
         add_custom_target(docs ALL DEPENDS doc-${PROJECT_NAME})
     endif(${PROJECT_NAME}_DOCS_EXISTS)
 endif(BUILD_DOCS)
+
+# INSTALLATION

config/Doxyfile.in

@@ -1249,7 +1249,7 @@ HTML_STYLESHEET        =
 # list). For an example see the documentation.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_STYLESHEET  =
+HTML_EXTRA_STYLESHEET  = @CMAKE_CURRENT_SOURCE_DIR@/config/doxygen-awesome/doxygen-awesome.css
 
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note