Add the ability to set individual commandline options at the expense of a generic Lua script

Note breaking change: Previously `--config` specified one or more Lua scripts that were executed to update the configuration state, now the `--config` sets the path to the window configuration instead

tests/main.cpp

@@ -65,8 +65,7 @@ int main(int argc, char** argv) {
 
     *global::configuration = configuration::loadConfigurationFromFile(
         configFile.string(),
-        glm::ivec2(0),
-        ""
+        glm::ivec2(0)
     );
     global::openSpaceEngine->registerPathTokens();
     global::openSpaceEngine->initialize();