sticky, dvert, and keys if number of verts don't match)
- changed modifier panel to not allow manual addition of hook or
softbody modifiers
- changed apply modifier to apply to existing mesh (fixes bug with
materials) and to warn about loss of tface/mcol/keys/dvert/sticky
for all modifier types
- changed modifier UI to not display disclosure triangle for virtual
modifiers
- changed softbody ui to allow enable/disable