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fde0d68c40
1) Flipped the order of "discover_vertical_shells" and "process_external_surfaces", now the external surfaces are expanded after "discover_vertical_shells" aka "ensure vertical wall thickness" is solved. 2) Reworked LayerRegion::process_external_surfaces() to only expand into "ensure vertical wall thickness" regions, also the expansion is done in small steps to avoid overflowing into neighbor regions. also: Utility functions reserve_more(), reserve_power_of_2(), reserve_more_power_of_2() Various SurfaceCollecion::filter_xxx() modified to accept an initializer list of surface types. New bridges detector refactored to accept overhang boundaries. BoundingBoxWrapper was moved from RetractCrossingPerimeters to AABBTreeIndirect.