Guitar dives

[mike-spa]

Implements guitar dive notation [WORK IN PROGRESS]

Done:

• New palette elements and icons for dives
• New palette element for w/bar line
• Center w/bar line between notation and tab staves
• Support for standard dives and pre-dives, dips, scoops, slack
• Support for layout on stave and above the stave
• New style options for dives
• Improved vertical alignement of TAB fret numbers to the notation stave, especially for grace notes. New options for aligning pre-bends and pre-dives to the grace note or to the main note.
• Modified the property panel for dives

To do:

• Support for adding bends and dives on the same notes