Small signalling server fixes.

[mcottontensor]

Relevant components:

• Signalling server
• Frontend library
• Frontend UI library
• Matchmaker
• Platform scripts
• SFU

Problem statement:

Two issues:

• Some logging calls like console.warn and console.error were not captured by the logging system and thus were not logged to files.
• If a streamer disconnected before it identified itself the id timer was never cleared and so a bad legacy name would be added and left behind.

Solution

• Added extra handlers for console.warn and console.error to properly log them.
• Cleared any id timer on streamer disconnect.

Fixes #439