Move module ISUPPORT lines into the modules themselves

[Xe]

This was a surprising thing to see.

• [x] MONITOR modules/m_monitor.so
• [x] CPRIVMSG/CNOTICE modules/m_cmessage.so
• [x] SAFELIST/ELIST modules/m_list.so
• [x] ETRACE modules/m_trace.so
• [x] KNOCK modules/m_knock.so
• [x] WHOX modules/m_who.so

[ariscop]

TARGMAX contains "MONITOR:", does that need to be updated as well?

[Xe]

i'm kinda afraid to touch that as I don't know what reads and relies on TARGMAX.