rename GetClassName/IsClass, declare mxtypes

Was intended as a simple code improvement, however it also seems to make WinMain, MxString::operator=, MxDSFile::Open 100% (all of which just needed registers to be switched around)

LEGO1/mxtypes.h

@@ -0,0 +1,21 @@
+#ifndef MXTYPE_H
+#define MXTYPE_H
+
+typedef unsigned char MxU8;
+typedef char MxS8;
+typedef unsigned short MxU16;
+typedef short MxS16;
+typedef unsigned int MxU32;
+typedef int MxS32;
+
+typedef unsigned char MxBool;
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#endif MXTYPE_H