Tweak MainMenu appearance to show this new option.
Simple new drawButton() graphics function.
Set a max value for transition delta, to keep from leaving gaps in the mask.
Use PascalCase for all constants, explain in new README.
Split 'make check' into a separate command (less likely to shift your files out from under you than 'make lint')
Add __stub.ext.lua with quick explainer for why it's useful.
Sage Vaillancourt