- remove the unused property OriginIsSet
- refurbish TaskDialog and add new settings:
- use SpinBox for Shape Scale
- add Font Size
- add Text Color
- add Line Width
- add Kink Length
- correct and add tooltips
- in the prefs we call the outline "shape" and this describes it better than "symbol" (it is the shape of the bubble). The line end, however, has a symbol so "Shape" makes clear that is is something different.
When clicking on balloon command, cursor is changing to balloon cursor.
It means user is ready to place a balloon (anywhere on the page).
Balloon object is not created until user click somewhere.
Balloon command can be aborted pressing escape or when page view lost
focus (in other words, when user clic somewhere else than the page).
