Eraser with feather
Merge pull request #159 from eVoLuTiVeMEDIA/master

Eraser has feather value
Scribblearea debris cleaning

1. scribblearea simplify
2. basetool: multi-instanced status variables changed to static
3. basetool funcions: startAdjust, stopAdjust
Merge pull request #161 from eVoLuTiVeMEDIA/master

Scribblearea debris cleaning
Merge branch 'master' into feature/color-picker
Resolve compile error