Cleanup and speed improvements

[jenskutilek]

As I’m often using the handy Overlay UFOs extension, I’ve had a look at the code and tried to clean up some things and make the scripts use less resources. Specifically I tried to minimize the time it takes to draw the source fonts.

• Overlays are now drawn behind the outline
• Window is a bit smaller to save space on screen
• Colours are saved in preferences
• updateView is called less often to save computing cycles
• MojoDrawingTools pen and ViewSourceFonts are in separate files so they are cached in compiled form automatically.

[FontBureau]

Wow, thank you Jens!

I have actually rebuilt this plugin, and will do my best to build your changes in the next version.

[jenskutilek]

Great, thanks!