Prohibit changing VRF
Prohibit changing VRF

We don't allow changing VRF since that will mess up other stuff.

Fixes #288

fredsod/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,SpriteLink/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,SoundGoof/NIPAP,ettrig/NIPAP,ettrig/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,SoundGoof/NIPAP,bbaja42/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,ettrig/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,plajjan/NIPAP,garberg/NIPAP,fredsod/NIPAP,ettrig/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,garberg/NIPAP,fredsod/NIPAP,plajjan/NIPAP,garberg/NIPAP,SpriteLink/NIPAP,plajjan/NIPAP,ettrig/NIPAP,garberg/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,plajjan/NIPAP,bbaja42/NIPAP,plajjan/NIPAP