Implemented typeof and added resetInterpreter()

scripts/test/imports-and-exports.toy

@@ -32,6 +32,17 @@
 	assert func() == 69, "import/export of functions failed";
 }
 
-//TODO: test that variables retain their types with the typeOf keyword
+//test that variables retain their types with the typeof keyword
+{
+	var t: type = int;
+
+	export t;
+}
+
+{
+	import t;
+
+	assert typeof t == type type, "type retention failed";
+}
 
 print "All good";