Low Prio: Only execute irc.mod:chan.c:gotrawt() when we have to

[michaelortmann]

I expect the code here:
https://github.com/eggheads/eggdrop/blob/develop/src/mod/irc.mod/chan.c#L2867-L2877
to only execute (remember: its executed for every single message from server) when the current server connection does support account-tags.

I ask for a mechanism to
https://github.com/eggheads/eggdrop/blob/develop/src/mod/irc.mod/irc.c#L1458
and
https://github.com/eggheads/eggdrop/blob/develop/src/mod/irc.mod/irc.c#L1349
on demand only,
depending on the state of CAP account-tag