implement all DLL exports (as TODOs)

Now we can use our own compiled LEGO1.LIB rather than one generated from the original. Also implements a script that tests them to help ensure future commits don't break them.

LEGO1/legobackgroundcolor.cpp

@@ -0,0 +1,7 @@
+#include "legobackgroundcolor.h"
+
+// OFFSET: LEGO1 0x1003bfb0
+LegoBackgroundColor::LegoBackgroundColor(const char *, const char *)
+{
+  // TODO
+}