Merge pull request #792 from sorlok/gm5_views

Extend GM5 plugin to support old "view" variables. Bind GM5 graphics better.
Fix for obj_1.depth = 10; crashing when obj_1 isn't in the room.
Merge branch 'depth_crash' into iji_2
GM5, experimental support for sprite_create_from_screen() using GM5's syntax.