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/bacdef.h

@@ -126,7 +126,7 @@
 #define BACNET_ARRAY_ALL 0xFFFFFFFFU
 /* For device object property references with no device id defined */
 #define BACNET_NO_DEV_ID   0xFFFFFFFFu
-#define BACNET_NO_DEV_TYPE 0xFFFFu
+#define BACNET_NO_DEV_TYPE OBJECT_NONE
 /* Priority Array for commandable objects */
 #define BACNET_NO_PRIORITY 0
 #define BACNET_MIN_PRIORITY 1
@@ -165,7 +165,7 @@ typedef struct BACnet_MAC_Address BACNET_MAC_ADDRESS;
    it might be better to have a packed encoding with a library to
    easily access the data. */
 typedef struct BACnet_Object_Id {
-    uint16_t type;
+    BACNET_OBJECT_TYPE type;
     uint32_t instance;
 } BACNET_OBJECT_ID;