starting from scratch now delivers a tune which renders without errors
player now throws user understandable error messages
Merge branch 'hotfix/demo' into develop
Merge branch 'hotfix/demo'
now implemented an experimental approach to render the tunes in an extra window.

* Allows to have an audience only see the tunes
* does not block the ui thread
* initial approach to send commands between windows
renamed Dacapo to Goto
now we also see synchpoint also get synclines
refactored Jumpline such that Default.layout does it all using path;
The engined no longer deal with Jumplines
Optimed layout of jump lines.
optimized handling of repetitions
now handle variant endings
note bound annotations
optimized handling of path; now arrows are filled.
sheet marks are now printed as big lines
subflowlines
optimized pitch of pause
refined note bound annotation positioning
refined SynchPoints handling such that first note in SynchPoint is reference for flowline and note bound annotation
initial lyrics support (fixed,  blank lines not shown in raphael)
Sheetmark at G,
optimized sheets marks
improve control over lyrics
improved positioning of voices and lyrics
optimized cutmarks