Updated links.
Added donate button.
- Fixes Articulation and Annotation positioning for TabNotes
- Fixes Annotation overlap bugs for StaveNotes
- Added TabNote Articulation and Annotation tests
- Added Annotation justification test for StaveNote's with stems down
- Fixes bugs which breaks applyAndGetBeams for tabnotes
- Adds TabNote auto_stem functionality to normalize stem directions on beam creation
Fixed lint errors, some stem refactoring.