Alpha 1.3

Full Changelog: v1.2-alpha...v1.3-alpha

• Fixed when drag and drop onto canvas was blocked if mouse was on a image
• Fixed odd behavior when drag/drop on tab-button was canceled and images where moved out of bounds
• Selection-box now works in all directions
• Images are correctly positioned on muli-move
• Note textbox now has correct height during multi-line edit
• Items no longer rescales after drag/drop on a tab-button
• Re-added ctrl-click selection

Added draft of focus window pan/zoom/reset behavior. At the moment it does not work all that great, but worth a shot.