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/win_discord.h

@@ -0,0 +1,28 @@
+/*
+ * 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.
+ *
+ *		Definitions for the Discord integration module.
+ *
+ *
+ *
+ * Authors:	David Hrdlička, <hrdlickadavid@outlook.com>
+ *
+ *		Copyright 2019 David Hrdlička.
+ */
+#ifndef WIN_DISCORD_H
+# define WIN_DISCORD_H
+
+extern int	discord_loaded;
+
+extern int	discord_load();
+extern void	discord_init();
+extern void	discord_close();
+extern void	discord_update_activity(int paused);
+extern void	discord_run_callbacks();
+
+#endif