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-debugger/jerry-client-ws.py

@@ -73,12 +73,13 @@ JERRY_DEBUGGER_STOP = 5
 JERRY_DEBUGGER_CLIENT_SOURCE = 6
 JERRY_DEBUGGER_CLIENT_SOURCE_PART = 7
 JERRY_DEBUGGER_NO_MORE_SOURCES = 8
-JERRY_DEBUGGER_CONTINUE = 9
-JERRY_DEBUGGER_STEP = 10
-JERRY_DEBUGGER_NEXT = 11
-JERRY_DEBUGGER_GET_BACKTRACE = 12
-JERRY_DEBUGGER_EVAL = 13
-JERRY_DEBUGGER_EVAL_PART = 14
+JERRY_DEBUGGER_CONTEXT_RESET = 9
+JERRY_DEBUGGER_CONTINUE = 10
+JERRY_DEBUGGER_STEP = 11
+JERRY_DEBUGGER_NEXT = 12
+JERRY_DEBUGGER_GET_BACKTRACE = 13
+JERRY_DEBUGGER_EVAL = 14
+JERRY_DEBUGGER_EVAL_PART = 15
 
 MAX_BUFFER_SIZE = 128
 WEBSOCKET_BINARY_FRAME = 2