Adds some UI framework for animation, see #51
Basic proof of concept, can add/delete frames and navigate through them, see #51
Implements play and stop animation, see #51
Fix for deleting the second to last animation frame, see #51
Loads and saves Zoxel files with animation, see #51
Minor fix for installer script version number handling.
Resize resizes all animation frames, translate just the current frame.
Adds model rotation in voxel space, closes #52. Reworks undo to support animation.
Add frame indicator to window title bar.
Fix undo and toolbar updates in some cases.
Fix loading Zoxel files with animation.
Move next/previous frame icons, add shortcut keys CTRL+arrows
Fix for deleting the first animation frame.
Remove Animation Settings action because we have no settings yet.
Fix: Don't rotate the camera when translating the camera.
Version bump 0.4.6
Merge branch 'develop'