Custom path support (#1333)

also including:
* getting rid of shitty strings
* all new, cleaner ROM handling code
* base for DSi savestates
* GBA slot addons (for now, memory cart)

src/Platform.h

@@ -145,6 +145,13 @@ void Mutex_Unlock(Mutex* mutex);
 bool Mutex_TryLock(Mutex* mutex);
 
 
+// functions called when the NDS or GBA save files need to be written back to storage
+// savedata and savelen are always the entire save memory buffer and its full length
+// writeoffset and writelen indicate which part of the memory was altered
+void WriteNDSSave(const u8* savedata, u32 savelen, u32 writeoffset, u32 writelen);
+void WriteGBASave(const u8* savedata, u32 savelen, u32 writeoffset, u32 writelen);
+
+
 // local multiplayer comm interface
 // packet type: DS-style TX header (12 bytes) + original 802.11 frame
 bool MP_Init();