overhang rgb=(200,0,0)，remove supportType,do not save para after overhang operation preview
Change-Id: I947bbd9db264f00f0609b3f02140060f9a2621fb
(cherry picked from commit 796c4460fe998da206f9ca77973a20796fa1d3ca)
1. add top view thumbnail for each plate
2. add picking thumbnails for each plate
3. save model object id for picking
Change-Id: I1d7f6ade22726ff12c282cb12e4a78e6b444a070
1.support hide funtion in assemble view
2.fix an issue that switch printable in assemble view will make
model-in-assemble-view turn transparent instead of model-in-view3D
3.fix a crash: right-click on objectlist after entering assemble view
Change-Id: Ia1a7ca492637eeaacd862ba015c440a55a83ca6e
1. set the unprintable volume to black even if it is mmu painted
2. add the bounding check logic when the object is partly inside of current plate
Change-Id: I69ce25eb85a71398ed8fb1d275136c5d943796d6
chunmao.guo
zhou.xu
lane.wei
zhimin.zeng
liz.li