Added the possibility for paratroopers to die on impact

as proposed in #5493. `LandOnlyInSuitableCell = false` is useful for testing purposes, but may be annoying for the players loosing their careless paratroopers so I made this an option we can simply disable later.
`>` makes sense here.
We don't want to play the Idle anim if we are being paradropped.
But this will need to change with iso-heightmaps coming into play.