Frame improvements

[akaDuality]

Continue of #326

UI improvements

• [ ] Allow to select frame from canvas
• [ ] Refactor element selection, the selected element should be preferred for selection
• [ ] Deprecate frame resizing or make it proportional
• [ ] When move an element over the frame should insert element inside container
  • [ ] And allow to move element's outside
  • [ ] Show it visually

Phone

• [ ] Update drawing at VODesignPreviewViewController to caching

Fixes

• [ ] Not clip element by container's bounds
• [x] Can't add image to empty document, won't read NSPasteboard #340

Other

• [x] Restore AppKit settings to speedup #339