Add lyrics support

Add support for comparison of lyrics within AllObjects (default diff) and AllObjectsWithStyle.

Diff non-notes, and optional detailed diff

Added diff of non-notes (clefs, etc), as well as detailed diff including style (text fonts, stem direction, note color, etc).
New DetailLevel parameter: GeneralNotesOnly (like v1), AllObjects (default), AllObjectsWithStyle (notice detailed differences)

Release version 1.0.1

Initial public release.