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/retro_disk_control.h

@@ -0,0 +1,86 @@
+/****************************************************************************
+ *  Caprice32 libretro port
+ *
+ *  Copyright not6 - r-type (2015-2018)
+ *  Copyright David Colmenero - D_Skywalk (2019-2021)
+ *  Copyright Daniel De Matteis (2012-2021)
+ *
+ *  Redistribution and use of this code or any derivative works are permitted
+ *  provided that the following conditions are met:
+ *
+ *   - Redistributions may not be sold, nor may they be used in a commercial
+ *     product or activity.
+ *
+ *   - Redistributions that are modified from the original source must include the
+ *     complete source code, including the source code for all components used by a
+ *     binary built from the modified sources. However, as a special exception, the
+ *     source code distributed need not include anything that is normally distributed
+ *     (in either source or binary form) with the major components (compiler, kernel,
+ *     and so on) of the operating system on which the executable runs, unless that
+ *     component itself accompanies the executable.
+ *
+ *   - Redistributions must reproduce the above copyright notice, this list of
+ *     conditions and the following disclaimer in the documentation and/or other
+ *     materials provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************************/
+
+#ifndef RETRO_DISK_CONTROL_H__
+#define RETRO_DISK_CONTROL_H__
+
+#include <stdbool.h>
+
+//*****************************************************************************
+// Disk control structure and functions
+#define DC_MAX_SIZE 20
+
+//static INLINE bool string_is_empty(const char* data)
+//{
+//	return !data || (*data == '\0');
+//}
+
+enum dc_image_type {
+	DC_IMAGE_TYPE_NONE = 0,
+	DC_IMAGE_TYPE_FLOPPY,
+	DC_IMAGE_TYPE_TAPE,
+	DC_IMAGE_TYPE_MEM,
+	DC_IMAGE_TYPE_UNKNOWN
+};
+
+struct dc_storage{
+	char* command;
+	char* files[DC_MAX_SIZE];
+	char* names[DC_MAX_SIZE];
+	enum dc_image_type types[DC_MAX_SIZE];
+	unsigned unit;
+	unsigned count;
+	int index;
+	bool eject_state;
+	bool replace;
+	unsigned index_prev;
+};
+
+typedef struct dc_storage dc_storage;
+dc_storage* dc_create(void);
+
+void dc_parse_m3u(dc_storage* dc, const char* m3u_file);
+bool dc_add_file(dc_storage* dc, const char* filename);
+void dc_free(dc_storage* dc);
+void dc_reset(dc_storage* dc);
+int dc_replace_file(dc_storage* dc, int index, const char* filename);
+bool dc_remove_file(dc_storage* dc, int index);
+enum dc_image_type dc_get_image_type(const char* filename);
+
+#endif