Remove redundancy of reoccurring links to the same license

[ischas]

By now in (nearly) every line of the license header there is a link to SPDX. Since most of the dependencies are licensed under MIT so there is always the same link.

The header should have a license section where the links to the licenses are bundled.

Now:

 * This software contains (parts of) the following software packages:
 * csscolorparser v1.0.3, https://github.com/deanm/css-color-parser-js, Dean McNamee <[email protected]>, License: MIT (https://spdx.org/licenses/MIT.html)
 * guide4you v1.2.9, https://github.com/KlausBenndorf/guide4you, Klaus Benndorf, License: MIT (https://spdx.org/licenses/MIT.html)
 * guide4you-module-search v1.2.5, https://github.com/KlausBenndorf/guide4you-module-search, Klaus Benndorf, License: MIT (https://spdx.org/licenses/MIT.html)
 * guide4you-module-urlapi v1.2.4, https://github.com/KlausBenndorf/guide4you-module-urlapi, Klaus Benndorf, License: MIT (https://spdx.org/licenses/MIT.html)
 * iscroll v5.2.0, http://iscrolljs.com, Matteo Spinelli <[email protected]> (http://cubiq.org), License: MIT (https://spdx.org/licenses/MIT.html)
 * jquery v3.1.0, https://jquery.com, jQuery Foundation and other contributors (https://github.com/jquery/jquery/blob/3.1.0/AUTHORS.txt), License: MIT (https://spdx.org/licenses/MIT.html)
 * lodash v4.14.1, https://lodash.com/, John-David Dalton <[email protected]> (http://allyoucanleet.com/), License: MIT (https://spdx.org/licenses/MIT.html)
 * notifyjs-browser v0.4.2, http://notifyjs.com/, Jaime Pillora, License: MIT (https://spdx.org/licenses/MIT.html)
 * openlayers v3.18.2, http://openlayers.org/, License: BSD-2-Clause (https://spdx.org/licenses/BSD-2-Clause.html)
 * proj4 v2.3.14, https://github.com/proj4js/proj4js#readme, License: MIT (https://spdx.org/licenses/MIT.html)
 * strip-json-comments v2.0.1, https://github.com/sindresorhus/strip-json-comments#readme, Sindre Sorhus <[email protected]> (sindresorhus.com), License: MIT (https://spdx.org/licenses/MIT.html)
 * webpack v1.13.1, https://github.com/webpack/webpack, Tobias Koppers @sokra, License: MIT (https://spdx.org/licenses/MIT.html)

Proposed:

 * This software contains (parts of) the following software packages:
 * csscolorparser v1.0.3, https://github.com/deanm/css-color-parser-js, Dean McNamee <[email protected]>, License: MIT
 * guide4you v1.2.9, https://github.com/KlausBenndorf/guide4you, Klaus Benndorf, License: MIT
 * guide4you-module-search v1.2.5, https://github.com/KlausBenndorf/guide4you-module-search, Klaus Benndorf, License: MIT
 * guide4you-module-urlapi v1.2.4, https://github.com/KlausBenndorf/guide4you-module-urlapi, Klaus Benndorf, License: MIT
 * iscroll v5.2.0, http://iscrolljs.com, Matteo Spinelli <[email protected]> (http://cubiq.org), License: MIT
 * jquery v3.1.0, https://jquery.com, jQuery Foundation and other contributors (https://github.com/jquery/jquery/blob/3.1.0/AUTHORS.txt), License: MIT
 * lodash v4.14.1, https://lodash.com/, John-David Dalton <[email protected]> (http://allyoucanleet.com/), License: MIT
 * notifyjs-browser v0.4.2, http://notifyjs.com/, Jaime Pillora, License: MIT
 * openlayers v3.18.2, http://openlayers.org/, License: BSD-2-Clause
 * proj4 v2.3.14, https://github.com/proj4js/proj4js#readme, License: MIT
 * strip-json-comments v2.0.1, https://github.com/sindresorhus/strip-json-comments#readme, Sindre Sorhus <[email protected]> (sindresorhus.com), License: MIT
 * webpack v1.13.1, https://github.com/webpack/webpack, Tobias Koppers @sokra, License: MIT
 * Licenses of the software packages:
 * BSD-2-Clause (https://spdx.org/licenses/BSD-2-Clause.html)
 * MIT (https://spdx.org/licenses/MIT.html)