Updated prop_bonus_round.sp

Fixed props regaining wearables and weapons from touching the resupply
cabinet.  Not useful for end-round stuff, but it's always good to fix up
things while propping players, right?
Updated prop_bonus_round.sp

Cleaned up hook method names and simplified HookEvent calls (as
EventHookMode_Post is implicit).
Updated prop_bonus_round.sp

Updated sm_prop to use the "slay" admin flag by default.  Seems more
appropriate.
Updated prop_bonus_round.sp

Fixed spawning and class-switching-in-spawn propped players.  Also
optimized unprop checks.
Updated prop_bonus_round.sp

Added some unused functionality to force a specific prop.
Updated prop_bonus_round.sp

Did some maintenance work on documentation and variable namings.