Message of cells got after dismantling

Added message of how many cells you get after dismantling sentry gun
(65) or dispenser
Grenades can be used during prematch
lasbolt is really railgun (ignore change)
Caltrop bugfix, Conc effect during prematch

Bugfix tf2.9: Caltrops are removed in 10 seconds if they dont touch the
ground.

Concs have no effect/stumble during prematch