bug#65253: Renpy-launcher raises exception when opening editor.

[Jesse Gibbons]

Here's a problem I diagnosed in the version of renpy installed by guix 
(hash 19a7a824c35eae56ce56e2a460042fb7e2129234):
Problem: Editor won't open, raises exception.
How to replicate:
1. Run renpy-launcher
2. Click any of the files under Edit File.
An exception is raised and the stack trace is dumped.
Cause: Editor files (*.edit.py) are not copied at install.
Proposed Solution: Copy editor files at install. I frankly don't care 
about Visual Studio Code or Atom, but at minimum "launcher/None.edit.py" 
and "launcher/System Editor.edit.py" must be included or the editor 
function won't work.

--
-Jesse Gibbons