Android v1.5.2

• Added original sound for notifications.
• Changed resend automatic algorithm, now it will try for 3 days and then give up. (Will be configurable in the future)
• Changed time that is saved for messages - it will be in UTC, and automatically converted in UI when viewed. (Old messages may shift after upgrade, I didn't bother to implement migration with conversion)
• Icons - they are new! Square, round, and adaptive!
• Added URL-encoding for mimir:// links, so that it will not be cut by spaces.
• You can now delete messages!