What's Changed
Added propagation of default image format to collage maker by #2698
Added shape layer type for markup layers
Added ability to group/ungroup markup layers
Added ability to change canvas size when using draw on background for markup layers
Markup project (itp) now will save undo/redo history
Decreased min scale for layer by #2700
Improved warp tool preview for continuous edits by #2699
Fixed ASCII Art tool inversion mode by #2706
UI improvements
Full Changelog: 3.8.1-alpha01...3.8.1-beta01
