Followup changes in JerryScript debugger after #1910.

* Remove 'jerry_debugger_cleaup'. Do it automatically in 'jerry_cleanup'.
* Updated the documentations.
* Updated the NuttX and Artik053 targets.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

docs/07.DEBUGGER.md

@@ -65,8 +65,8 @@ All available commands of the client can be queried by the
 
 ## Integrating debugger support into applications using JerryScript
 
-The debugger can be enabled by passing the `JERRY_INIT_DEBUGGER` flag
-to the `jerry_init ()` function which then initializes the debugger
+The debugger can be enabled by calling the `jerry_debugger_init (uint16_t port)`
+function after the `jerry_init ()` function. It initializes the debugger
 and blocks until a client connects.
 
 When the debugger is enabled it is recommended to use
@@ -83,6 +83,36 @@ debugger is disabled.
 The following section describes the debugger functions
 available for the host application.
 
+### jerry_debugger_init
+
+**Summary**
+
+Debugger server initialization. Must be called after `jerry_init`.
+
+**Prototype**
+
+```c
+void
+jerry_debugger_init (uint16_t port);
+```
+
+- `port` - Server port number
+
+
+**Example**
+
+```c
+{
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
+
+  // ...
+
+  jerry_cleanup ();
+}
+```
+
+
 ### jerry_debugger_is_connected
 
 **Summary**
@@ -100,12 +130,15 @@ jerry_debugger_is_connected (void);
 
 ```c
 {
-  jerry_init (JERRY_INIT_DEBUGGER);
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
 
   if (jerry_debugger_is_connected ())
   {
     printf ("A remote debugger client is connected.");
   }
+
+  jerry_cleanup ();
 }
 ```
 
@@ -129,9 +162,12 @@ jerry_debugger_stop (void)
 
 ```c
 {
-  jerry_init (JERRY_INIT_DEBUGGER);
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
 
   jerry_debugger_stop ();
+
+  jerry_cleanup ();
 }
 ```
 
@@ -160,9 +196,12 @@ jerry_debugger_continue (void)
 
 ```c
 {
-  jerry_init (JERRY_INIT_DEBUGGER);
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
 
   jerry_debugger_continue ();
+
+  jerry_cleanup ();
 }
 ```
 
@@ -191,7 +230,8 @@ jerry_debugger_stop_at_breakpoint (bool enable_stop_at_breakpoint)
 
 ```c
 {
-  jerry_init (JERRY_INIT_DEBUGGER);
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
 
   jerry_debugger_stop_at_breakpoint (true);
 
@@ -199,6 +239,8 @@ jerry_debugger_stop_at_breakpoint (bool enable_stop_at_breakpoint)
   jerry_eval (...);
 
   jerry_debugger_stop_at_breakpoint (false);
+
+  jerry_cleanup ();
 }
 ```
 
@@ -221,7 +263,8 @@ jerry_debugger_wait_and_run_client_source (jerry_value_t *return_value)
 **Example**
 
 ```c
-  jerry_init (JERRY_INIT_DEBUGGER);
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
 
   jerry_value_t run_result;
   jerry_debugger_wait_and_run_type_t receive_status;
@@ -239,6 +282,8 @@ jerry_debugger_wait_and_run_client_source (jerry_value_t *return_value)
     jerry_release_value (run_result);
   }
   while (receive_status == JERRY_DEBUGGER_SOURCE_RECEIVED);
+
+  jerry_cleanup ();
 ```
 
 ### jerry_debugger_send_output
@@ -258,8 +303,13 @@ At the moment only the JS print size is implemented.
 **Example**
 
 ```c
+  jerry_init (JERRY_INIT_EMPTY);
+  jerry_debugger_init (5001);
+
   jerry_char_t my_output = "Hey, this should be sent too!";
   jerry_size_t my_output_size = sizeof (my_output);
 
   jerry_debugger_send_output (my_output, my_output_size, JERRY_DEBUGGER_OUTPUT_OK);
+
+  jerry_cleanup ();
 ```