Tool - Selection for Carto

Select using: a) rectangle b) ellipse c) magic wand (settings: color tolerance) d) free hand selection Selection should be resizable

Tools should paint in dedicated thread for Carto

Running in separate thread won't block UI

Undo system allows to manage history of changes for Carto

use data compressing Undo system settings: size of undo stack (how many undos do you want?) size of an undo-cache (everything which not fits to this one, goes to disk-cache). turn on/off undo system