pause on background instead of disconnecting

[SandiyosDev]

app kills the parsec connection when you switch apps or lock screen , this pr uses ParsecClientPause to pause and resume video/audio streams

some issues would appear where keys remain pressed even after disconnect, this pr would release all pressed keys on background so key presses doesn't get stuck on the host; gl render loop is also paused so it doesnt crash the app on sleep disconnects

pip controller is now only created when the setting is on (builds on #62), I added a toggle in settings for PiP, I also added toggles for status (top bar) and fixed mute to stop host audio streams instead of muting locally

[hugeBlack]

idk if you have noticed but the root cause of disconnecting in background is not OpenParsec actively disconnecting from host, but VideoToolBox failed to decode the frame in the background for some reason. And the error code we get from ParsecSDK is -14 (DECODE_ERR_DECODE).

<<<< FigApplicationStateMonitor >>>> signalled err=-19431 at <>:474
[D] decoder       = vt
[D] codec         = h265
<< FigOSEventLink >> signalled err=-19424 at <>:817
<<<< DecompressionSessionRemote >>>> signalled err=-12903 at <>:1867
[I] * vt_decode_frame/VTDecompressionSessionDecodeFrame[335] = -12903
<<<< DecompressionSessionRemote >>>> signalled err=-12903 at <>:2849

Even with this pr I still get this error with the video stream frozen.
So I guess it's either an issue within the ParsecSDK or iOS itself does not allow decoding frames if the app enters background.