Feature/write property type check refactor (#182)

* refactor write-property tag check

* modify ports objects to use write-property tag check API

* modify example objects to use write-property tag check API

* Fix object unit test builds

* Fix and run unit ztests via CMake

* Enable unit testing on Travis CI

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

src/bacnet/basic/object/av.h

@@ -211,13 +211,6 @@ extern "C" {
     void Analog_Value_Init(
         void);
 
-#ifdef BAC_TEST
-#include "ctest.h"
-    BACNET_STACK_EXPORT
-    void testAnalog_Value(
-        Test * pTest);
-#endif
-
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */