Additional Trap Properties and functions (Issue + request)

[ErminioLucente]

Here are several requests all tied to traps.

• ISSUE
  A Known issue, traps don't use named effects/shots.

• REQUEST 1 : Additional cast types
  Allow users to directly cast the trap to the map, armed and ready.
  -By manufacturing and increase usable quantity OR...
  -additional setting to allow users to pay, to cast a trap.
  Without having to wait for imps to place boxes.

• REQUEST 2 : Re-ARM
  A new property to allow traps to stay or be removed from map when ammo is depleted.
  Additional related property that allows a delay between re-arming the trap to be used again right away.
  so... a machine gun with 100 shots, that remains depleted for 400tics, before rearming.

• REQUEST 3 : new effect + sfx
  A new sound property for when a trap has been depleted, and effect used when the trap has depleted and vanished, if request 2 is added.

• REQUEST 4 : damage
  A trap specific damage property that overrides the shot damage and can be used in conjunction with STRENGTH_BASED flag.

• REQUEST 5 : blocker
  A trap that can block specific creatures from passing