Remove cppcheck and vera++ from prerequisites

Rely on platform-provided versions. Thus, no need to download and
build them, neither to wrap them with shell scripts. CMake and
precommit updated to call the new tools. Development documentation
also updated/simplified.

PS: On my Ubuntu 14.04.3, cppcheck has version 1.61, while prereq
version was 1.69. The older version reports and fails on a strange
style issue in ecma/builtin-objects/ecma-builtin-helpers.cpp, for
which the only solution found was to suppress the cppcheck errors
with `variableScope` id for that file.

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

tools/vera++/vera.sh

@@ -1,28 +0,0 @@
-#!/bin/bash
-
-# Copyright 2015 Samsung Electronics Co., Ltd.
-#
-# 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.
-
-REPOSITORY_DIR=$(dirname $0)/../..
-VERA=$REPOSITORY_DIR/third-party/vera++/bin/vera++
-
-if [ ! -x $VERA ]
-then
-  exit 1;
-fi
-
-$VERA "$@"
-status_code=$?
-
-exit $status_code