Add ability to manually modify msupcm++ code

[MattEqualsCoder]

Unfortunately due to #125, this can't use the track.json format, but I can export the internal classes to YAML for editing.

• [x] Add ability to copy a msupcm++ details to clipboard
• [x] Add ability to paste & overwrite msupcm++ details from clipboard
• [x] Add ability to copy full song details
• [x] Fix pasting of True/False combo boxes
• [x] Create schema files