visualeffects.2da column name correction and unused fields

[Finaldeath]

I've noticed that the visualeffects.2da column "SoundCessastion" is mispelled. The engine reads "SoundCessation" as per vfx_persistent.2da has. I can of course fix this manually before release and it only affected 3 VFX lines but I think worth fixing :)

These fields also don't work since instead the "cessation" animation of the current duration animation plays (except in the case of the ProgFX_Cessation apparently) so these can be culled from being generated saving some space in the 2da via. some kind of option perhaps.

Ces_Impact_Node
Ces_Root_S_Node
Ces_Root_M_Node
Ces_Root_L_Node
Ces_Root_H_Node