MessageSpatial2D::In::wrap() (#794)

* MessageSpatial2D::In::wrap()

Needs better testing, will post model I was playing with in PR comments.

* Add getVirtualX() getVirtualY() to the wrapped iterator message.

* Add a test that spatial2D wrapped messages work as intended.

It might be a little naive, but should catch if things break badly.

* 3D support and test added

+some additional minor cleanup (mostly removing redundant references.

* docs fix

* Add SEATBELTS to catch out of bounds messages.

Improve tests for non-zero environment min and out of bounds.

* Updates following FGPU meeting.

include/flamegpu/runtime/messaging/MessageSpatial2D.h

@@ -65,7 +65,7 @@ class MessageSpatial2D {
         /**
          * max-lowerBound
          */
-        float environmentWidth[3];
+        float environmentWidth[2];
     };
 };