Add core stack headers into bacdef.h and cleanup includes. (#602)

* Added dependent BACnet stack headers into bacdef.h file.

* Changed bacdef.h and other stack includes in c/h files to have a common pattern.

* Moved bits.h, bytes.h, and bacnet_stack_exports.h under bacnet/basic/sys/ folder.

ports/win32/bacport.h

@@ -26,7 +26,7 @@
 #ifndef BACPORT_H
 #define BACPORT_H
 
-#include "bacnet/bacnet_stack_exports.h"
+#include "bacnet/basic/sys/bacnet_stack_exports.h"
 
 #define WIN32_LEAN_AND_MEAN
 #define STRICT 1

ports/win32/dlmstp-mm.c

@@ -29,13 +29,15 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
+/* BACnet Stack defines - first */
 #include "bacnet/bacdef.h"
+/* BACnet Stack API */
 #include "bacnet/bacaddr.h"
 #include "bacnet/datalink/mstp.h"
 #include "bacnet/datalink/dlmstp.h"
-#include "rs485.h"
 #include "bacnet/npdu.h"
-#include "bacnet/bits.h"
+/* port specific */
+#include "rs485.h"
 
 #define WIN32_LEAN_AND_MEAN
 #define STRICT 1

ports/win32/dlmstp.c

@@ -30,15 +30,18 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+/* BACnet Stack defines - first */
 #include "bacnet/bacdef.h"
+/* BACnet Stack API */
 #include "bacnet/bacaddr.h"
-#include "bacnet/bits.h"
 #include "bacnet/npdu.h"
 #include "bacnet/basic/sys/ringbuf.h"
 #include "bacnet/basic/sys/mstimer.h"
 #include "bacnet/datalink/mstp.h"
 #include "bacnet/datalink/dlmstp.h"
+/* OS common includes */
 #include "bacport.h"
+/* port specific */
 #include "rs485.h"
 
 /* Number of MS/TP Packets Rx/Tx */

ports/win32/rs485.h

@@ -37,7 +37,6 @@
 #define RS485_H
 
 #include <stdint.h>
-#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/datalink/mstp.h"
 #include "bacport.h"