Zombie-related fixes

- Zombies no longer see themselves in room or object contents
- Zombies no longer see their own drop, wake-up or fall-asleep messages
- Fixed Thing.Tell's prefix ignoring linebreaks
Cleaned up mpi.lua's header
Added parms for DB dump notifications
Fixed timestamps using 12 instead of 24 hours
Added useless UTC-localtime conversions

We might go to UTC times only in the database, but... more likely not.
Just gonna leave this here, though.
Rewrote 'examine', removed OnExamine hooks

It also supports the COLOR flag!
Exits can now be linked to zombies

This is the canonical way of controlling them, since there's no do-nothing
object or program at this time to let us use @succ={FORCE}.
Pennies are now only earned by visiting rooms
Added automatic ANSI reset to MU.Send
Added more color to 'examine'