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/math-trunc.js

@@ -0,0 +1,36 @@
+// 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.
+
+var nan = NaN;
+var p_zero = 0.0;
+var m_zero = -p_zero;
+var p_inf = Infinity;
+var m_inf = -p_inf;
+
+function isSameZero (x, y)
+{
+  return x === 0 && (1 / x) === (1 / y);
+}
+
+assert (isNaN(Math['trunc'](NaN)));
+assert (isSameZero (Math['trunc'](p_zero), p_zero));
+assert (isSameZero (Math['trunc'](m_zero), m_zero));
+assert (Math['trunc'](p_inf) === p_inf);
+assert (Math['trunc'](m_inf) === m_inf);
+assert (isSameZero (Math['trunc'](0.5), p_zero));
+assert (isSameZero (Math['trunc'](-0.5), m_zero));
+assert (Math['trunc'](1.2) === 1);
+assert (Math['trunc'](-1.5) === -1);
+assert (Math['trunc'](65.7) === 65);
+assert (Math['trunc'](-24.9) === -24);