RCA Update

Update RCA to work with AmpliPi version 0.2.0+

Disconnect Fix

Adding RCA introduced a bug where the wallpanel would crash when the amplipi was disconnected/restarted. This fixes that.

RCA Support

The WallPanel can now select the current source's RCA as an input in the stream selector.

Media Controls Fix

Media controls now reflect the capabilities of the current stream. Fixed bug in 0.2.7 where the available stream commands weren't being polled.

Password Hiding

Password is now hidden when the connection page loads. Added a loading spinner for the connect action.