Remove ES_NEXT macro (#4915)

- remove all '#JERRY_ESNEXT' macro
- remove 5.1 build profile, update test runner accordingly (Note: all builtins are turn on by default)
- move tests from tests/jerry/esnext into tests/jerry, concatenate files with same names
- add skiplist to some snapshot tests that were supported only in 5.1
- fix doxygen issues that were hidden before (bc. of es.next macro)

Co-authored-by: Martin Negyokru negyokru@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/builtin-prototypes.js

@@ -21,3 +21,49 @@ assert (Boolean.prototype.valueOf() === false);
 
 assert (Object.prototype.toString.call (Number.prototype) === '[object Number]');
 assert (Number.prototype.valueOf() === 0);
+
+var prototypes = [
+    Date.prototype,
+    RegExp.prototype,
+    Error.prototype,
+    EvalError.prototype,
+    RangeError.prototype,
+    ReferenceError.prototype,
+    SyntaxError.prototype,
+    TypeError.prototype,
+    URIError.prototype
+  ]
+
+for (proto of prototypes) {
+  assert (Object.prototype.toString.call (proto) === '[object Object]');
+}
+
+try {
+  Date.prototype.valueOf();
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+try {
+  RegExp.prototype.exec("");
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+try {
+  RegExp.prototype.compile("a", "u");
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+assert (RegExp.prototype.source === '(?:)');
+assert (RegExp.prototype.global === undefined);
+assert (RegExp.prototype.ignoreCase === undefined);
+assert (RegExp.prototype.multiline === undefined);
+assert (RegExp.prototype.sticky === undefined);
+assert (RegExp.prototype.unicode === undefined);
+assert (RegExp.prototype.dotAll === undefined);
+assert (RegExp.prototype.flags === '');