Allow attaching tags with extra info to stats rows.

Stats responses are incredibly non-standard and no clients render
them correctly. This makes using /STATS a massive pain in the ass
for users.

However, now we have message tags we have a way to fix this. We can
send a <trailing> with the message details and for clients (probably
bots) that need to parse the response we can include the specific
details in message tags enabled by the new inspircd.org/stats-tags
capability.

The average user will get this:

    :<server> 210 <nick> <stats-char> :<stats-message>

If however they enable the newcapability they will get this instead:

    @inspircd.org/stats-foo=bar;inspircd.org/stats-baz=bax :<server> 210 <nick> <stats-char> :<stats-message>

0 files changed, 0 insertions, 0 deletions