Current todos:
- Visibility filter for element types,
- Multiple positive templates,
- Negative templates,
- Fix fill on some elements, particularly phrases, slurs and ties. The fill currently gets a bit mangled when combining duplicate elements,
- Fix 'bringIntoView',
- If user changes character value by certain amount (288 - ascii value), prompt if they want to do so for the rest of the font,
- 'Character' button on ElementTypeDialog. Maybe colour ok and 'ok no save' buttons red and green,
- Lunch,
- Save score data (either after auto parsing has finished or when user has finished bulk of changes.. probably the former),
- Break score up into lines,
- Store fonts in db,
- Start adding musical context to elements.

- Lunch eaten.
- Starting work on filter. Hijacking Glyph type list since it's now replaced by the ElementTypeDialog. GlyphTypeHolder now has a Show bool.
- Added Show/Hide All checkbox, updated GlyphTypeHolder DataTemplate, hooked up bindings.