Updated the Lua wrapper code for modules to account for cases where the module's instance is removed from memory completely and recreated during the program's lifetime.

src/modules/math/MathModule.cpp

@@ -87,6 +87,8 @@ Math Math::instance;
 Math::Math()
 	: rng()
 {
+	moduleType = M_MATH;
+
 	// prevent the runtime from free()-ing this
 	retain();
 }