oops: mountain deformer ui
Mountain Deformer SOP/VOP changes
- namespace was forgotten, now added
- minor UI fixes
- help for VOP
Mountain Deformer SOP: Help card
Mountain Deformer SOP: in-asset node name is now conformant
fixed placement xform parameter inputs
Mountain Deformer SOP: viewport handles (xform) + minor c.c.
NEW: Bias Deformer SOP
Merged deformer work: Mountain, Bias
These two basic types of deformers:
- Mountain is 'displace' type (calculates a displacement vector and applies it to the geometry points)
- Bias is of 'point pos' type (calculates a new point position based on the old one)

The reason of these two types are distinguished because they have slightly different internal structure.