Finalized DynamicFont implementation

-DynamicFont uses Freetype by default
-Editor fonts are now scalable thanks to this
-Cleaned up documentation browser and added fonts for this

tools/editor/code_editor.h

@@ -135,6 +135,7 @@ class CodeTextEditor : public Control {
 
 	void _on_settings_change();
 
+	void _update_font();
 	void _complete_request();
 protected: