v0.61.10-beta release

It's possible to upgrade to 0.61 only from 0.60.X. If you're on an older version, download and run 0.60.4 first. Only after that upgrade to 0.61.

Changed since last beta:

• sync fixes (thanks for big help in reporting & reproducing the problems from @deajan)
• show existing backups and anonymized DBs, #4321
• removed maxTouchPoints condition for detection of mobile browsers, #4316
  add api.runOutsideOfSync() to backend script API, #4327 (experimental)
• fix expanded status when moving note trees
• add canvas properties with a button to copy reference to clipboard which allows inserting canvas as an image into text notes