Add GBA cart model and allow reading from it

src/GBACart.h

@@ -0,0 +1,52 @@
+/*
+    Copyright 2019 Arisotura, Raphaël Zumer
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef GBACART_H
+#define GBACART_H
+
+#include "types.h"
+#include "Savestate.h"
+
+
+namespace GBACart_SRAM
+{
+
+extern u8* SRAM;
+extern u32 SRAMLength;
+
+}
+
+
+namespace GBACart
+{
+
+extern bool CartInserted;
+extern u8* CartROM;
+extern u32 CartROMSize;
+
+bool Init();
+void DeInit();
+void Reset();
+
+void DoSavestate(Savestate* file);
+bool LoadROM(const char* path, const char* sram);
+void RelocateSave(const char* path, bool write);
+
+}
+
+#endif // GBACART_H