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.

Makefile.common

@@ -19,6 +19,7 @@ SOURCES_C := \
 	$(LIBRETRO_COMM_DIR)/encodings/encoding_utf.c \
 	$(LIBRETRO_COMM_DIR)/file/file_path.c \
 	$(LIBRETRO_COMM_DIR)/file/file_path_io.c \
+	$(LIBRETRO_COMM_DIR)/streams/memory_stream.c \
 	$(LIBRETRO_COMM_DIR)/string/stdstring.c \
 	$(LIBRETRO_COMM_DIR)/time/rtime.c \
 	$(LIBRETRO_COMM_DIR)/vfs/vfs_implementation.c
@@ -27,7 +28,10 @@ SOURCES_C += \
 	$(CORE_DIR)/libretro/libretro-core.c \
 	$(CORE_DIR)/libretro/core-mapper.c \
 	$(CORE_DIR)/libretro/graph.c \
-	$(CORE_DIR)/libretro/vkbd.c
+	$(CORE_DIR)/libretro/vkbd.c \
+	$(CORE_DIR)/libretro/retro_strings.c \
+	$(CORE_DIR)/libretro/retro_utils.c \
+	$(CORE_DIR)/libretro/retro_disk_control.c
 
 SOURCES_C += \
 	$(CORE_DIR)/atari800/src/afile.c \