Transfer cancelled on iOS due to auto-lock

[donpui]

iOS by default has short screen auto-lock (30sec- 1min).
If user sends bigger file or network is slower and user is not actively using/looking at phone, screen gets turned off and transfer gets cancelled (network interruption). Problems exists and for Sender and for Receiver.
Issue also appears if User only waits while receiver enters the code, as soon network interruption happens, codes is invalidated.

Possible solution/workarounds:

• integrate nosleep.js, which should prevent sleeping, while there are active processes (waiting to enter code or download is in progress on Sender or Receiver sides);

[donpui]

Implemented and deployed, thanks @JustusFT