Highlight bookmarked ayahs and improve highlighting:
- Differentiate highlight types (allow multiple at once e.g. selection and audio)
- Highlight by drawing Rect instead of Bitmap
- Colors for different highlight types
When (un)bookmarking an ayah (un)highlight it accordingly
Add option to disable bookmark highlighting
Change HighlightType from enum to class (so we can create new highlight types from tags)
Minor highlighting fixes
Load highlight colors from xml
Merge pull request #363 from afarra/master

Highlight bookmarked ayahs and improve highlighting: