Update TODO

Mark `dd` task complete.
Add 3 Octave Notes for typing

Delete old notes
Add new Directory "songs"

Move Cantina to songs
Update TODO

Add a few new TODOs from earlier this week.
autoload/auditory.vim: Update insert mode file listing

Use the new C# scale files in insert mode for a wider range of notes.
autoload/auditory.vim: Update Cantina path

Cantina sound files are now in the Resources/Songs/ directory.
Merge branch 'New-Sounds'