-project settings are saved when changed

-load() was in the GDScript docs but missing in the scripting-different music for platformer 2D and 3D
-fix how documentation is generated, built in doc browser should be always up to date
-copypaste, scrolling, etc in  builtin doc
-built-in scripts get saved now (though debugger may not always work on them)
-Theme can be set to controls as a property

core/io/xml_parser.h

@@ -113,6 +113,8 @@ public:
 	Error seek(uint64_t p_pos);
 
 	Error open(const String& p_path);
+	Error open_buffer(const Vector<uint8_t>& p_buffer);
+
 	void close();
 
 	XMLParser();