Adds more actions and shortcuts to manage:

*) shortcuts for note pad values split for TAB and non-TAB note entry
*) TAB: fret note entry, string and chord navigation with easier shortcuts
Adds more actions and shortcuts to manage:

*) shortcuts for note pad values split for TAB and non-TAB note entry
*) TAB: new shortcuts for increase/decrease note pad value
*) TAB: fret note entry, string and chord navigation with easier shortcuts
*) HARMONY/FIGBASS: shortcuts for 'measured' advances
*) HARMONY/FIGBASS: shortcuts for jump to prev/next measure
*) HARMONY: shortcuts for jump to prev/next beat
Resolves conflicts by commenting out MuseScore::enableInputToolbar()
Swap actions "pitch-up/down" and pitch-up/down-diatonic" for TAB's
Add [Shift][#] and NumPad [#] shortcuts for pad note value selection
Keep "pad-note-...-TAB" shortcuts always disabled and "pad-note.---" actions enabled in all input modes.

Key sequences for "pad-note-...-TAB" shortcuts are swapped into "pad-note-..." actions when entering TAB entry mode and original key sequences restored when leaving it.
Merge pull request #298 from mgavioli/shortcuts_TAB_2

Improved TAB note entry and shortcuts