Secure ReadProperty decoding and BACnetActionCommand (#702)

* Refactored and secured BACnetActionCommand codec into bacaction.c module for command object and added to bacapp module encode/decode with define for enabling and pseudo application tag for internal use.

* Simplified bacapp_data_len() and moved into bacdcode module as bacnet_enclosed_data_len() function.

* Secured ReadProperty-REQUEST and -ACK decoding.

* Removed deprecated Keylist_Key() functions from usage.

* Removed pseudo application datatypes from bacapp_data_decode() which only uses primitive application tag encoded values.

* Defined INT_MAX when it is not already defined by compiler or libc.

* Deprecated bacapp_decode_application_data_len() and bacapp_decode_context_data_len() as they are no longer used in any code in the library.

* Added BACnetScale to bacapp module. Improved complex property value decoding. Refactored bacapp_decode_known_property() function.

* Refactored and improved the bacapp_snprintf() function for printing EPICS.

* Fixed Lighting Output WriteProperty to handle known property decoding.

src/bacnet/bacenum.h

@@ -1557,7 +1557,7 @@ typedef enum {
     BACNET_APPLICATION_TAG_RESERVE3 = 15,
     MAX_BACNET_APPLICATION_TAG = 16,
 
-    /* Extra stuff - complex tagged data - not specifically enumerated */
+    /* Complex tagged constructed data types - not specifically enumerated */
 
     /* Means : "nothing", an empty list, not even a null character */
     BACNET_APPLICATION_TAG_EMPTYLIST,
@@ -1602,7 +1602,11 @@ typedef enum {
     /* BACnetBDTEntry */
     BACNET_APPLICATION_TAG_BDT_ENTRY,
     /* BACnetFDTEntry */
-    BACNET_APPLICATION_TAG_FDT_ENTRY
+    BACNET_APPLICATION_TAG_FDT_ENTRY,
+    /* BACnetActionCommand */
+    BACNET_APPLICATION_TAG_ACTION_COMMAND,
+    /* BACnetScale */
+    BACNET_APPLICATION_TAG_SCALE
 } BACNET_APPLICATION_TAG;
 
 /* note: these are not the real values, */