base for savestate crapo.

I'm not quite settled yet, so before I can get into the real meat, I figured I'd address some 'popular request' items.

src/Savestate.h

@@ -0,0 +1,55 @@
+/*
+    Copyright 2016-2017 StapleButter
+
+    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 SAVESTATE_H
+#define SAVESTATE_H
+
+#include <stdio.h>
+#include "types.h"
+
+#define SAVESTATE_MAJOR 1
+#define SAVESTATE_MINOR 0
+
+class Savestate
+{
+public:
+    Savestate(char* filename, bool save);
+    ~Savestate();
+
+    bool Error;
+
+    bool Saving;
+    u32 VersionMajor;
+    u32 VersionMinor;
+
+    u32 CurSection;
+
+    void Section(char* magic);
+
+    void Var8(u8* var);
+    void Var16(u16* var);
+    void Var32(u32* var);
+    void Var64(u64* var);
+
+    void VarArray(void* data, u32 len);
+
+private:
+    FILE* file;
+};
+
+#endif // SAVESTATE_H