Introduce debugger status flags to control the operation of the debugger. (#1596)

Two issues were fixed as well: inserting breakpoints before non-directive
prologue strings and the receive can process multiple messages.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/debugger/jerry-debugger.h

@@ -43,6 +43,17 @@
 #define JERRY_DEBUGGER_SEND_MAX(type) \
  ((JERRY_DEBUGGER_MAX_SEND_SIZE - sizeof (jerry_debugger_send_header_t) - 1) / sizeof (type))
 
+/**
+ * Debugger option flags.
+ */
+typedef enum
+{
+  JERRY_DEBUGGER_CONNECTED = 1u << 0, /**< debugger is connected */
+  JERRY_DEBUGGER_VM_STOP = 1u << 1, /**< stop at the next breakpoint
+                                     *   regardless it is enabled */
+  JERRY_DEBUGGER_VM_IGNORE = 1u << 2, /**< ignore all breakpoints */
+} jerry_debugger_flags_t;
+
 /**
  * Types for the package.
  */