[Tracking] WebRTC: resolve TODOs

[TheArcaneBrony]

Generated at commit 57827bc9:

• src/webrtc/opcodes/Identify.ts:28: // noinspection JSUnusedLocalSymbols - TODO: use video?
• src/webrtc/util/Send.ts:10: // TODO: encode circular object
• src/webrtc/events/Connection.ts:27: // TODO: check rate limit
• src/webrtc/events/Connection.ts:28: // TODO: specify rate limit in config
• src/webrtc/events/Connection.ts:29: // TODO: check msg max size
• src/webrtc/events/Message.ts:31: // TODO: if all opcodes are implemented comment this out: