Fix first run crashing on Xbox One. Added savestate support. Rewind … (#87)

* Fix first run crashing on Xbox One.
* Added savestate support.
* Rewind works.  Fixes issue #83 and possibly #49.
* Added Disc Control menu.  Supports Disks, Tapes and M3U files (issue #66).
* Added in support for 5200 Super Carts.
* Better support for 5200 controller.
* Added Paddle support.
* Converted Core Options menu to v2.
* Moved some core options into submenus.
* Added controller mappings for Ports 2-4.
* Added options for Dual Stick and Swap Ports.  Fixes issue #76.
* Joystick/Console now controlled more easily with device type Atari Keyboard.
* Added 4 Hi-Res Artifacting modes.  Restart does something now.
* When core option changed only reboot if necessary.  Removed several hardcoded controller binds.  Fixed issue #29.  Joypad input ignored when virtual keyboard active.
* SIO Acceleration now defaults to enabled.  Fix for Bounty Bob (5200 & lift fix A800).
* Added Atari 800 carts to autodetect DB.
* Added more Carts to DB.
* Fixed Drive Index not being reset on 'restart'.
* Changed Atari Joystick default mappings to something more reasonable.

libretro/libretro-core.h

@@ -36,8 +36,7 @@
 extern cothread_t mainThread;
 extern cothread_t emuThread;
 
-extern char Key_Sate[512];
-extern char Key_Sate2[512];
+extern char Key_State[512];
 
 extern int pauseg; 
 
@@ -76,4 +75,13 @@ extern int pauseg;
 #endif
 #define uint32 unsigned int
 #define uint8 unsigned char
+
+//Paddle & 5200 POT
+#define LIBRETRO_ANALOG_RANGE 0x8000
+#define JOY_5200_MIN 6
+#define JOY_5200_MAX 220
+#define JOY_5200_CENTER 114
+
+void retro_message(const char* text, unsigned int frames, int alt);
+void retro_audio_cb(short l, short r);
 #endif