Vpn status notifications

cybertarequested to merge
vpn_status_notifications into main

built on top of !15 (merged) which needs to be reviewed first

  • relates to #41 (closed)
  • shows ellapsed time since VPN was connected (using Android's notification chronometer feature)
  • added data usage statistics in notifications, facilitates to finish #63 (closed)
Edited by cyberta

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