* very shitty implementation of save RAM. requires an existing save file for now.

* refine some SPI code, too. mostly removing a useless function.
* support 16bit accesses to DMAxCNT registers.

SPI.h

@@ -22,6 +22,8 @@
 namespace SPI
 {
 
+extern u16 Cnt;
+
 void Init();
 void Reset();