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/machine/m_at_socket8.c

@@ -19,27 +19,27 @@
 #include <stdlib.h>
 #include <string.h>
 #include <wchar.h>
-#include "86box.h"
-#include "mem.h"
-#include "86box_io.h"
-#include "rom.h"
-#include "pci.h"
-#include "device.h"
-#include "chipset.h"
-#include "hdc.h"
-#include "hdc_ide.h"
-#include "keyboard.h"
-#include "intel_flash.h"
-#include "via_vt82c586b.h"
-#include "intel_sio.h"
-#include "piix.h"
-#include "sio.h"
-#include "sst_flash.h"
-#include "hwm.h"
-#include "spd.h"
-#include "video.h"
+#include <86box/86box.h>
+#include <86box/mem.h>
+#include <86box/io.h>
+#include <86box/rom.h>
+#include <86box/pci.h>
+#include <86box/device.h>
+#include <86box/chipset.h>
+#include <86box/hdc.h>
+#include <86box/hdc_ide.h>
+#include <86box/keyboard.h>
+#include <86box/intel_flash.h>
+#include <86box/via_vt82c586b.h>
+#include <86box/intel_sio.h>
+#include <86box/piix.h>
+#include <86box/sio.h>
+#include <86box/sst_flash.h>
+#include <86box/hwm.h>
+#include <86box/spd.h>
+#include <86box/video.h>
 #include "cpu.h"
-#include "machine.h"
+#include <86box/machine.h>
 
 
 #if defined(DEV_BRANCH) && defined(USE_I686)