Make queue max message size configurable

Summary
-------
This commit fixes the issue #424

Details
--------
- Add a the configuration option TX_QUEUE_MESSAGE_MAX_SIZE in the tx_api.h with default value
  set to TX_ULONG_16 to keep backword compatibility.
- Update the txe_queue_create() to check on TX_QUEUE_MESSAGE_MAX_SIZE rather than TX_ULONG_16
  as max message size.
- Add a new unitary test to cover the new change.

common/inc/tx_api.h

@@ -328,6 +328,12 @@ extern   "C" {
 #define TX_TIMER_TICKS_PER_SECOND       (100UL)
 #endif
 
+/* Define the default maximum message size in a queue. The default value is TX_16_ULONG, but may
+   be customized in tx_user.h or as a compilation option. */
+
+#ifndef TX_QUEUE_MESSAGE_MAX_SIZE
+#define TX_QUEUE_MESSAGE_MAX_SIZE           TX_16_ULONG
+#endif
 
 /* Event numbers 0 through 4095 are reserved by Azure RTOS. Specific event assignments are:
 

common/inc/tx_user_sample.h

@@ -117,6 +117,13 @@
 #define TX_TIMER_THREAD_PRIORITY                ????
 */
 
+/* Define the maximum size of a message in the a queue. the Default value is TX_ULONG_16.
+   the new value must be a multiple of ULONG. */
+
+/*
+#define TX_QUEUE_MESSAGE_MAX_SIZE              TX_ULONG_16
+*/
+
 /* Define the common timer tick reference for use by other middleware components. The default
    value is 10ms (i.e. 100 ticks, defined in tx_api.h), but may be replaced by a port-specific
    version in tx_port.h or here.

common/src/txe_queue_create.c

@@ -178,8 +178,8 @@ TX_THREAD       *thread_ptr;
             status =  TX_SIZE_ERROR;
         }
 
-        /* Check for an invalid message size - greater than 16.  */
-        else if (message_size > TX_16_ULONG)
+        /* Check for an invalid message size - greater than TX_QUEUE_MESSAGE_MAX_SIZE 16 by default.  */
+        else if (message_size > TX_QUEUE_MESSAGE_MAX_SIZE)
         {
 
             /* Invalid message size specified.  */