Made bacepics' output more correct for VTS3 EPICS parsing.

Put command line argument checking and usage printing into their own functions,
and added an optional argument to show values instead of '?' for properties like Present_Value.
Added screening of properties that should normally be replaced with '?' on output.
Added a few enums to bactext (Node_Type, Polarity).

bacnet-stack/include/bactext.h

@@ -94,6 +94,8 @@ extern "C" {
         unsigned index);
     const char *bactext_binary_present_value_name(
         unsigned index);
+    const char *bactext_binary_polarity_name(
+        unsigned index);
     bool bactext_binary_present_value_index(
         const char *search_name,
         unsigned *found_index);
@@ -103,6 +105,8 @@ extern "C" {
         unsigned index);
     const char *bactext_segmentation_name(
         unsigned index);
+    const char *bactext_node_type_name(
+        unsigned index);
 
     const char *bactext_event_transition_name(
         unsigned index);