Modify logic for "and" and "or" operator and in_area function. Add null marshaling for input proxy.

Assets/Cryville/Crtr/InputProxy.cs

@@ -117,10 +117,15 @@ namespace Cryville.Crtr {
 		readonly byte[] _vecbuf = new byte[3 * sizeof(float) + sizeof(int)];
 		unsafe void OnInput(InputIdentifier id, InputVector vec, string target) {
 			_etor.ContextCascadeInsert();
+			if (vec.IsNull) {
+				_etor.ContextCascadeUpdate(_var_value, new PropSrc.Arbitrary(PdtInternalType.Null, new byte[0]));
+			}
+			else {
 			fixed (byte* ptr = _vecbuf) {
 				*(Vector3*)ptr = vec.Vector;
 			}
 			_etor.ContextCascadeUpdate(_var_value, new PropSrc.Arbitrary(PdtInternalType.Vector, _vecbuf));
+			}
 			OnInput(id, target);
 			_etor.ContextCascadeDiscard();
 		}