Refactor IrcProvider just a little

[craftxbox]

🆑 Core Refactors the IrcProvider to be a bit more resilient. Fixes the IrcProvider getting permanently stuck if the connection between TGS and IRC is ever severed. Adds the OPER Irc authentication mode, helpful for anyone running their own IRC servers. /🆑

🆑 Nuget: API Adds IrcPasswordType.Oper for /OPER authentication /🆑

🆑 HTTP API Adds new IRC authentication type with index 3 for /OPER authentication /🆑

Related to #1085 but I don't think it should close it. IrcProvider would break entirely if it ever got disconnected, stuck in a weird infinite loop of trying to connect but aborting of its own accord. This solves that issue by minting a new IrcFeatures client every time a connection attempt is made. Additionally, the implementation was slightly flaky and would emit useless and broken bytes at the start of every session, this confuses irc servers and should be avoided. IrcProvider will now actually wait for a successful registration instead of just absolutely bean blasting the server and hoping it works. The test has been amended to wait and check to ensure the IrcProvider actually stays connected to a server for atleast 2 seconds, and does this test twice. This amended test would have caught the issue in the original IrcProvider.

Also adds a new authentication mode OPER which, as the name implies will do an IRC /OPER at connect. Maybe i'm just the only weirdo who needs that, if so, i'll gladly strip it out if needed. My only justification is that I run a irc server without services and just use the +O (ircop only) channel mode to restrict people getting into my admin channel.

Tested over 2 days, atleast from what I can see is fully functioning and not causing any issues.