1. hybrid(auto) on_buildplate_only option not working correctly because
parent is not set.
2. tree(auto) on_buildplate_only not working correctly because unsupported
branch isn't deleted completely. I add child to track the dangling nodes
and then delete nodes with no child.
Change-Id: I24c69a7cf400d2961b22a720a6069cf95db6c1a5
(cherry picked from commit bce77c16128d35c668b175e7135b9fe9acd71d13)
0. disable arranging selected
1. fix bug where brim is not correct.
2. fix bug where big circle objects are not arranged properly
3. disable default enable_rotation
Change-Id: Ifc69f35d900ff63ec1e9ec8bf8638afc6ea7d54b
(cherry picked from commit 2ed1b0dd8573a1e10aaf77f0d9f8896cef304427)