use View::setWidget & View::setToolBar consistently
Move BranchesView's toolBar into a hid file
Rename of directory
Adjust to removal of GlobalView
Advances for ContextViews
Remove Heaven::ViewTypes
Port Branches-View to use tree and model
Fix compiler warning and leak
Unfished: Just pushing to switch PCs

Mainly: Introduce ViewIdentifier
Fix tree arrangement

Damn how i love copy & paste. Nothing gets lost, not even mistakes or
obvious errors...
Prepare for CtxData
Port branches to ContextData
Rename methods
Don't let the tree view header vanish in WorkTree