(RFC and WIP) Send SETNAME to server, when cap setname enabled and realname is changed

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
(WIP) Send SETNAME to server, when cap setname enabled and realname is changed

Additional description (if needed):
Also raise max botrealname from 80 to 130. all irc servers have default 50. and then there is inspircd:

maxreal 	Number 	130 	The maximum length of a real name.
https://docs.inspircd.org/4/configuration/

Test cases demonstrating functionality (if applicable):

    Active CAP negotiations: setname
    isupport: WHOX WATCHOPTS=A WATCH=128 WALLCHOPS USERIP UHNAMES TOPICLEN=360 TARGMAX=DCCALLOW:,ISON:,JOIN:,KICK:4,KILL:,LIST:,NAMES:1,NOTICE:1,PART:,PRIVMSG:4,SAJOIN:,SAPART:,TAGMSG:1,USERHOST:,USERIP:,WATCH:,WHOIS:1,WHOWAS:1 STATUSMSG=~&@%+ SILENCE=15 SAFELIST QUITLEN=307 PREFIX=(qaohv)~&@%+ NICKLEN=30 NETWORK=ExampleNET NAMESX NAMELEN=50 MSGREFTYPES=msgid,timestamp MONITOR=128 MODES=12 MINNICKLEN=0 MAXNICKLEN=30 MAXLIST=b:60,e:60,I:60 MAP
[...]
.set realname foo42
[02:40:08] tcl: builtin dcc call: *dcc:set -HQ 1 realname foo42
[02:40:08] #-HQ# set realname foo42
DEBUG: traced_realname() namelen005 = 50
[02:40:08] [!s] SETNAME foo42
Ok, set.
[02:40:08] [s->] SETNAME foo42
[02:40:08] [@] :test23!tcl9eggdro@Clk-8553FB0D SETNAME :foo42

[michaelortmann]

Link #1514 and #1756