Fix logging issues in the debugger. (#2483)

- Properly handle logging during transport close
 - Properly display data during parse

Furthermore hide global functions of the debugger.

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

tests/debugger/do_print.js

@@ -0,0 +1,28 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+print("Hello world!");
+print("A", "[", "", "]", 1.1e2, null, true, undefined);
+print();
+print("[A\nB", "C\nD", "E\nF\nG]");
+
+var s = "";
+
+for (i = 1; i <= 100; i++) {
+  /* Translated from hungarian: life is beautiful */
+  s += i + ": Az élet gyönyörű.\n";
+}
+
+/* Long string with non-ascii characters. */
+print(s);