PlayModeChanged emitted in maquetteScene (not in maquetteView)
Work on copy/paste : AbstractBox(otherAbBox) constructor now gets start/end messages from otherAbBox
Problem TimeBarWidget updated during execution fixed
Copy boxes : copy messages (but not curve shapes)
Copy boxes - mistake on last commit
refresh (empty methos) deleted
updateProgressBar cleaned
timeBar object removed from MaquetteWidget (only in MaquetteScene) - zoom is updated from MaquetteView
calls to SoundBoxType/ControlBoxType removed from Maquette and MaquetteScene
Calls to Palette deleted
Delete obsolete files : SoundBox, ControlBox, Palette, PreviewArea, EnumPalette, contextMenus
obsolete includes removed
dev prints cleaned
Merge branch 'dev-clean' into dev

Conflicts:
	src/GUI/MaquetteScene.cpp
	src/GUI/MaquetteWidget.cpp
	src/data/Maquette.cpp