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/mxpalette.h

@@ -11,7 +11,7 @@
 class MxPalette : public MxCore
 {
 public:
-  __declspec(dllexport) unsigned char operator==(MxPalette &);
+  __declspec(dllexport) MxBool operator==(MxPalette &);
   __declspec(dllexport) void Detach();
 
   MxResult GetEntries(LPPALETTEENTRY p_entries);