1. do not add interface for small overhangs so supports are easier to
remove
2. calculate avoidance more accurately using real layer height
jira: STUDIO-6285
3. hybrid nodes won't collide with lower layers
4. calculate max move more accurately
5. do not increase radius if next layer has collision
jira: STUDIO-2296, STUDIO-7883
6. rewrite plan_layer_heights to prevent support layers overlap.
Now the tree support layers are completely independent to object layers.
6. increase collision areas for interface. The top layers may be too
close to interface with adaptive layer heights and very small overhang angle
Change-Id: I052c3f66e68afb7663e2d70c846dd09ed7086071
(cherry picked from commit aca511caebfdeec270d4fc0ec6bbbadde77cddc9)
(cherry picked from commit f2fc996652b3b204b4e554f57afed8519feb0397)
5054ee8508