Made shader property flags interace dynamic, to avoid spelling mistakes and mismatches on format update.

Fixed name error of Facegen Detail Map property, causing it not to be exported. Added condition to not export normals when using a face tint (as done in face meshes).

Added default NONE game for in the scene tab, and a comprehensive error when they forget to set the game.

Changed collision layer to be game dependent, rather than relying on Oblivion collision layers. No Skyrim functionality - best fix for that would be pyffi/nif.xml update.

Changed import/export of BSInvMarker to produce more user-friendly values in the interface, and updated the docs accordingly.

Removed Niftools dismemberment panel (and fixed small missing import in update_skin_partition). Partition order now based on vertex group order, and part flags are set automatically.