gui: old code removed
gui: code cleanup

more consts :]
gui: TreeItemDelegate: preparations for selection
gui: ImagesTreeView: updating selectionModel
gui: ImagesTreeView: applying selection
gui: TreeItemDelegate: fixing node selection

QPainter: saving and restoring modified objects
gui: TreeItemDelegate: saving rotation for photos

Saving rotation for last 1000 photos
Merge branch 'development'