Depsgraph and collection enable/visibility

Iterate over invisible objects too, so lamps can still lit the scene.
Also, now you can use a collection to set an object to invisible, not
only to visible.

For example:
Scene > Master collection > bedroom > furniture
Scene > View Layer > bedroom    (visible)
                   > furniture  (invisible)

The View Layer has two linked collections, bedroom and furniture.
This setup will make the furniture collection invisible.

Note: Unlike what was suggested on D2849, this does not make collection
visibility influence camera visibility. I will keep this as a separate
patch.

Reviewers: sergey

Subscribers: sergey, brecht, fclem

Differential Revision: https://developer.blender.org/D2849

source/blender/draw/engines/eevee/eevee_engine.c

@@ -29,6 +29,8 @@
 #include "BLI_dynstr.h"
 #include "BLI_rand.h"
 
+#include "BKE_object.h"
+
 #include "GPU_material.h"
 #include "GPU_glew.h"
 
@@ -93,6 +95,10 @@ static void EEVEE_cache_populate(void *vedata, Object *ob)
 	}
 
 	if (ELEM(ob->type, OB_MESH)) {
+		if (!BKE_object_is_visible(ob)) {
+			return;
+		}
+
 		EEVEE_materials_cache_populate(vedata, sldata, ob);
 
 		const bool cast_shadow = true;