Fix (most) compilation warnings in Intel C++ Compiler (#38)

* Use BACNET_OBJECT_TYPE for all object type variables.

* Fix ICC "mixing enumerated type" warnings for assignments and parameters.

* Network Port: Use enums for state structs and remove erroneous bounds checks copy-pasted from IP_Subnet_Prefix setter.

* Fix ICC "unreachable statement" warnings.

* Fix ICC "unused variable" warnings when printing is disabled.

* Fix ICC "mixing enumerated type" warnings for struct initializers { 0 } by ensuring the first member is an integer type.

* Send_GetEvent_Global: Return 0 (invalid TSM invoke ID) instead of -1 = 255 (technically valid invoke ID) on failure.

* Fix ICC "pointless comparison" warnings.

* Fix wrong import in objects.c (memset being used).

* Fix signedness warnings and inconsistencies. Include -1 = 255 check in cov_address_get().

* Add some guards for BACAPP_LIGHTING_COMMAND to avoid errors/warnings.

* RPM test fixes

* Address requested changes. (#38)

src/bacnet/basic/service/s_dcc.c

@@ -64,7 +64,9 @@ uint8_t Send_Device_Communication_Control_Request(uint32_t device_id,
     bool status = false;
     int len = 0;
     int pdu_len = 0;
+#if PRINT_ENABLED
     int bytes_sent = 0;
+#endif
     BACNET_CHARACTER_STRING password_string;
     BACNET_NPDU_DATA npdu_data;
 
@@ -98,7 +100,10 @@ uint8_t Send_Device_Communication_Control_Request(uint32_t device_id,
         if ((unsigned)pdu_len < max_apdu) {
             tsm_set_confirmed_unsegmented_transaction(invoke_id, &dest,
                 &npdu_data, &Handler_Transmit_Buffer[0], (uint16_t)pdu_len);
-            bytes_sent = datalink_send_pdu(
+#if PRINT_ENABLED
+            bytes_sent =
+#endif
+            datalink_send_pdu(
                 &dest, &npdu_data, &Handler_Transmit_Buffer[0], pdu_len);
 #if PRINT_ENABLED
             if (bytes_sent <= 0)