Move all include files to src/include

- 86Box's own headers go to /86box
- munt's public interface goes to /mt32emu
- all slirp headers go to /slirp (might want to consider using only its public inteface)
- single file headers from other projects go in include root

src/include/86box/sst_flash.h

@@ -0,0 +1,20 @@
+/*
+ * 86Box	A hypervisor and IBM PC system emulator that specializes in
+ *		running old operating systems and software designed for IBM
+ *		PC systems and compatibles from 1981 through fairly recent
+ *		system designs based on the PCI bus.
+ *
+ *		This file is part of the 86Box distribution.
+ *
+ *		Implementation of an SST flash chip.
+ *
+ *
+ *
+ * Author:	Melissa Goad, <mszoopers@protonmail.com>
+ *		Copyright 2020 Melissa Goad.
+ */
+
+extern const device_t sst_flash_29ee010_device;
+extern const device_t sst_flash_29ee020_device;
+extern const device_t sst_flash_39sf010_device;
+extern const device_t sst_flash_39sf020_device;