Require bacdef.h as first bacnet header to include (#598) (#600)

* Require bacdeps.h as first bacnet header to include

BACnet headers need to pull in optional configuration and
optional ecosystem overrides to allow integrators to control
builds.  This commit changes bacnet header files to first
include bacnet/bacdep.h to consistently introduce integrator
header files.

Verified by:

1. make clean all test

2. ./zephyr/scripts/twister -p unit_testing \
        -T bacnet-stack/zephyr/tests/



* Migrate BACNET_UNSIGNED_INTEGER defn to bacdef.h

Verified by:

1. make clean all test

2. ./zephyr/scripts/twister -p unit_testing \
        -T bacnet-stack/zephyr/tests/



---------

Signed-off-by: Gregory Shue <gregory.shue@legrand.com>
Co-authored-by: Greg Shue <32416235+gregshue@users.noreply.github.com>
Co-authored-by: Gregory Shue <gregory.shue@legrand.com>

src/bacnet/bacdef.h

@@ -26,9 +26,8 @@
 
 #include <stddef.h>
 #include <stdint.h>
-#include "bacnet/bacenum.h"
-#include "bacnet/bacint.h"
 #include "bacnet/config.h"
+#include "bacnet/bacenum.h"
 
 #if defined(_MSC_VER)
 /* Silence the warnings about unsafe versions of library functions */
@@ -127,6 +126,15 @@
 #error MAX_ASHRAE_OBJECT_TYPE and MAX_BACNET_SERVICES_SUPPORTED not defined!
 #endif
 
+/* Support 64b integers when available */
+#ifdef UINT64_MAX
+typedef uint64_t BACNET_UNSIGNED_INTEGER;
+#define BACNET_UNSIGNED_INTEGER_MAX UINT64_MAX
+#else
+typedef uint32_t BACNET_UNSIGNED_INTEGER;
+#define BACNET_UNSIGNED_INTEGER_MAX UINT32_MAX
+#endif
+
 /* largest BACnet Instance Number */
 /* Also used as a device instance number wildcard address */
 #define BACNET_MAX_INSTANCE (0x3FFFFF)