v1.15-r3

1.15-r3

• Fix a bug causing to "forget" the keyfile with Sync in background (#3275)

previous 1.15 changes

• Fix to keyboard layout on newer devices
• Make WebDav transaction implementation more robust by renaming differently
• Added background synchronization: Keepass2Android now uses the internal cache copy of the database for loading and saving to make these operations faster. After this, synchronization with the remote database is started.
• Added user preferences to control behavior of background synchronization. You can enable periodic background synchronization and control if synchronization should be performed always or only in Wi-Fi networks.
• Improvements to URL handling for WebDav with non-ASCII characters
• Improvements to OneDrive Authentication