[TD] Balloon fixes

- 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

src/Mod/TechDraw/App/DrawViewBalloon.h

@@ -56,9 +56,7 @@ public:
     App::PropertyFloatConstraint ShapeScale;
     App::PropertyDistance    OriginX;
     App::PropertyDistance    OriginY;
-    App::PropertyBool        OriginIsSet;
     App::PropertyFloat       TextWrapLen;
-
     App::PropertyDistance    KinkLength;
 
     short mustExecute() const override;