added basic mappers

mappers/nullmapper.cpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <stdint.h>
+
+#include "../datatypes.cpp"
+#include "../helpers.cpp"
+#include "mapperbase.cpp"
+
+namespace UwU {
+  class NullMapper : public MapperBase<NullMapper> {
+    public:
+      NullMapper() {}
+
+      Coord2 map(uint16_t x, uint16_t y) {
+        return Coord2(x, y);
+     }
+  };
+}