System channel not working properly

[Em3rgencyLT]

The system channel is meant to be a channel that must always be seen by all players, but is impossible to send a message to as a player.

The initial implementation of this attempted to do this by hiding the channel from the possible dropdown list when select which channel to send a message to. This caused the issue if all channels being 1 index offset to their true name. So sending to engi would send to AI instead, which is 1 above.

The feature was temporarily disabled until someone finds the time to fix it.

It might be worth ignoring this feature until we have headsets, as chat will probably undergo changes once we need to dynamically change permissions.