Clean & correct palette hint
Mobile palette: shortcut moved to configuration list

1. Shortcut C can be changed as any other
2. Some enhancements for a better usage and future changes
Pick color with alpha
Please, check the alpha channel with color picker! is it ok?
Merge pull request #185 from eVoLuTiVeMEDIA/master

Code cleaning and configurable shortcut for popup palette
Picked color transparency compensation
Merge pull request #186 from eVoLuTiVeMEDIA/master

Picked color transparency compensation
Merge branch 'master' of https://github.com/pencil2d/pencil