Add context reset to the debugger.

- The context reset request message can be sent anytime from a client.
- After the message received the engine will call the cleanup and init
  when in the source waiting mode (which means the currently processed file will be executed).
- After the reinitialization is done, the engine will wait
  for a new client connection(rest of the work is the client's responsibility).

JerryScript-DCO-1.0-Signed-off-by: Imre Kiss kissi.szeged@partner.samsung.com

jerry-core/include/jerryscript-debugger.h

@@ -35,6 +35,7 @@ typedef enum
   JERRY_DEBUGGER_SOURCE_RECEIVE_FAILED = 0, /**< source is not received */
   JERRY_DEBUGGER_SOURCE_RECEIVED = 1, /**< a source has been received */
   JERRY_DEBUGGER_SOURCE_END = 2, /**< the end of the sources signal received */
+  JERRY_DEBUGGER_CONTEXT_RESET_RECEIVED, /**< the context reset request has been received */
 } jerry_debugger_wait_and_run_type_t;
 
 /**