Highlight when my nick appears anywhere inside message

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Hello,

some other IRC (xchat & weechat IIRC) clients supports highlighting
nicknames in the middle of the message. This is usual scenario in
gaming channels

<nick1> nick2: nick3 nick4 TDM?
<nick1> nick2: nick3: nick4: TDM?
<nick1> nick2, nick3 nick4 TDM?

(nick separators depend on TAB behavior of user's client)

Attached patch modifies nick_match_msg() function to support it.

I'm not fluent C programmer and I still don't fully understand how
this function works (fuzziness) so sorry if I overlooked something. I
tested it a bit and it seems it works.

--=20
Tom=C3=A1=C5=A1 Nechutn=C3=BD

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