o cleanup

o refactor debug function
o add ifeq platform to makefile
o get crc working on bank 0

snes/crc/debug.h

@@ -1,2 +1,5 @@
 void initDebugMap(void);
-void debug(void);
+void debug(void);
+void int2hex(word i, char *buf);
+void writeln(char* line,word y);
+void enableDebugScreen(void);