Implement missing data types for calendar and schedule (#474)

* Added the SpecialEvent struct for the Exception_Schedule property of Schedule, encode/decode/same functions, unit tests, and integrated into bacapp functions.

* Added the CalendarEntry struct for the Date_List property of Calendar and the SpecialEvent struct, encode/decode functions, unit tests, and integrated into bacapp functions.

* Added the DateRange struct for the Effective_Period property of Schedule, encode/decode functions, unit tests, and integrated into bacapp functions.

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

test/bacnet/bacreal/src/main.c

@@ -7,7 +7,7 @@
 /* @file
  * @brief test BACnet real value encode/decode APIs
  */
-
+#include <math.h>
 #include <zephyr/ztest.h>
 #include <bacnet/bacreal.h>
 #include <bacnet/bacdef.h>
@@ -34,7 +34,7 @@ static void testBACreal(void)
     zassert_equal(len, 4, NULL);
     test_len = decode_real(&apdu[0], &test_real_value);
     zassert_equal(test_len, len, NULL);
-    zassert_equal(test_real_value, real_value, NULL);
+    zassert_false(islessgreater(test_real_value, real_value), NULL);
 }
 
 /**
@@ -54,7 +54,7 @@ static void testBACdouble(void)
     zassert_equal(len, 8, NULL);
     test_len = decode_double(&apdu[0], &test_double_value);
     zassert_equal(test_len, len, NULL);
-    zassert_equal(test_double_value, double_value, NULL);
+    zassert_false(islessgreater(test_double_value, double_value), NULL);
 }
 /**
  * @}