couple of mapper fixes (#482)

* Fix a couple of mapper issues

- Implement info->Close, to free any unallocated memory (e.g. WRAM)
- Add missing GameStateRestore function
- Add missing state variable

* Simplify header parsing

* Update ines-correct.h

Co-authored-by: negativeExponent <negativeExponent@users.noreply.github.com>

src/boards/558.c

@@ -26,6 +26,8 @@
 #include "eeprom_93C66.h"
 #include "../ines.h"
 
+static uint8 *WRAM;
+static uint32 WRAMSIZE;
 static uint8 reg[4];
 static uint8 haveEEPROM;
 static uint8 eeprom_data[512];
@@ -97,17 +99,32 @@ static void reset(void)
    sync();
 }
 
+static void close(void)
+{
+   if (WRAM)
+      FCEU_gfree(WRAM);
+   WRAM = NULL;
+}
+
+static void StateRestore(int version)
+{
+   sync();
+}
+
 void Mapper558_Init (CartInfo *info)
 {
-   uint8 *WRAM;
-   uint32 WRAMSIZE = info->PRGRamSize + (info->PRGRamSaveSize &~0x7FF);
    info->Power   = power;
    info->Reset   = reset;
+   info->Close   = close;
    GameHBIRQHook = hblank;
+
+   GameStateRestore = StateRestore;
    AddExState(StateRegs, ~0, 0, 0);
 
+   WRAMSIZE = info->PRGRamSize + (info->PRGRamSaveSize &~0x7FF);
    WRAM = (uint8*) FCEU_gmalloc(WRAMSIZE);
    SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
+   AddExState(WRAM, WRAMSIZE, 0, "WRAM");
    FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
    haveEEPROM =!!(info->PRGRamSaveSize &0x200);
    if (haveEEPROM)