BlenderProc 2.7.1

• new camera projection helper methods are available: bproc.camera.depth_via_raytracing(), bproc.camera.pointcloud_from_depth(), bproc.camera.project_points(), bproc.camera.unproject_points() (#1045, #1075)
• .blend loader now also supports hair_curves (#1052, thanks @sagoyal2)
• adds .usd loader (#1043, thanks @freLorbeer)
• fixes memory leak in bop writer (#1086, thanks @matteomastrogiuseppe)
• fixes removal of scene properties (#1055)
• fixes incorrect warnings regarding hidden objects in bop writer (#1058, thanks @saprrow)
• fixes linking objects when duplicating object hierarchy (#1081, thanks @AndreyYashkin)