Make debugger port runtime configurable

Convert debug server port from a compile-time constant to a context
variable. This enables each engine instance (either running in the
same process or in different processes) to listen for connections
at different ports, i.e., multiple engines can be debugged at the
same time on the same machine.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/jcontext/jcontext.h

@@ -121,6 +121,7 @@ typedef struct
   uint8_t debugger_message_delay; /**< call receive message when reaches zero */
   uint16_t debugger_receive_buffer_offset; /**< receive buffer offset */
   int debugger_connection; /**< holds the file descriptor of the socket communication */
+  uint16_t debugger_port; /**< debugger socket communication port */
 #endif /* JERRY_DEBUGGER */
 
 #ifdef JMEM_STATS