Bugfix/print property name units lighting (#313)

* Fix EPICS property name proprietary range

* Fix Lighting Command decode length

* add function to determine property name and units proprietary range

* improve test coverage for AI, AO, AV, BI, BO, BV, LO

* refactor common property encoding to proplist module

* add decoder for priority array

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

src/bacnet/bactext.h

@@ -69,6 +69,9 @@ extern "C" {
     const char *bactext_event_type_name(
         unsigned index);
     BACNET_STACK_EXPORT
+    bool bactext_property_name_proprietary(
+        unsigned index);
+    BACNET_STACK_EXPORT
     const char *bactext_property_name(
         unsigned index);
     BACNET_STACK_EXPORT
@@ -84,6 +87,9 @@ extern "C" {
         const char *search_name,
         unsigned *found_index);
     BACNET_STACK_EXPORT
+    bool bactext_engineering_unit_name_proprietary(
+        unsigned index);
+    BACNET_STACK_EXPORT
     const char *bactext_engineering_unit_name(
         unsigned index);
     BACNET_STACK_EXPORT