JavaNative: Moved loading of method return type to a latter time

Background: If the return type was a generic parameter, that early it wouldn't have been populated yet, and why load the return type as first thing in a method anyways?

JavaIntegration/src/main/java/org/openzen/zencode/java/JavaNativeModule.java

 			Parameter[] javaParameters,
 			TypeVariable<Method>[] javaTypeParameters,
 			AnnotatedType[] exceptionTypes) {
-		StoredType returnType = javaReturnType == null ? BasicTypeID.VOID.stored : loadStoredType(context, javaReturnType);
 
 
 		TypeParameter[] typeParameters = new TypeParameter[javaTypeParameters.length];
 		if (exceptionTypes.length > 1)
 			throw new IllegalArgumentException("A method can only throw a single exception type!");
 
+		StoredType returnType = javaReturnType == null ? BasicTypeID.VOID.stored : loadStoredType(context, javaReturnType);
 		StoredType thrownType = exceptionTypes.length == 0 ? null : loadStoredType(context, exceptionTypes[0]);
 		return new FunctionHeader(typeParameters, returnType, thrownType, AutoStorageTag.INSTANCE, parameters);
 	}