improve the colorPicker

Begin to try to adapt the display of colours to the values which are entered in inputs of the colorPicker
replace scrollbar, fix some errors in colorPicker

use scrollArea instead of scrollBar
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop

Conflicts:
	buttleofx/gui/paramEditor/qml/ParamEditor.qml
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop