1. add a hook inside tree branches for improved strength
2. fix the issue that interface may fly as a mess (delete the logic
where gap nodes can skip dropping down)
3. fix the issue that base nodes may fly as a mess (smoothing should
skip polygon nodes, see Jira:STUDIO-4403)
Change-Id: Ie9f2039813c2ca3127ed8913304cc455fec8e7ee
(cherry picked from commit 83cef5f91d49ff3d275a89ec3df8b5f0fd573f8c)
Add a new suport style "Tree Organic" from Prusa, as organic support is
faster and seems more strong in some cases. Thanks to Prusa.
Feature detection including sharp tail, small overhang, long cantilever,
are still kept.
Known issue: first layer support path may go outside build plate.
Jira: STUDIO-2358
Github: #2420
Change-Id: I4cec149bf4fa9eb733ae720ac1a7f65098e3b951
(cherry picked from commit d977bc5d3b4609f4fec0aa68152a33cacf184c4a)
arthur