* fixed crash when recording
* fixed recorded clip not playing
* auto-download is set with constraints of power and connection
* on charging, no longer start blind auto-download
* corrected recording dir to the previously set external/media/clips, and performs a migration
* a recorded clip name is now changed to the form of "MMmSS-MMmSS" from "MM:SS-MM:SS" (not allowed by Android's SAF)
* clips can be imported/exported, and are included in Auto-backup
