Fix version-history window layout
Fix bug with saving extarnal canvases which imported several times
Action::LayerEmbed: Fix autogeneration of name of new canvas
Merge remote-tracking branch 'ivan/improve-zip-container' into morevna

* ivan/improve-zip-container:
  Action::LayerEmbed: Fix autogeneration of name of new canvas
  Fix bug with saving extarnal canvases which imported several times
  Fix version-history window layout