Add an offline mode to DokuWiki

All documentation for this plugin can be found at https://dokuwiki.org/plugin:pwaoffline

If you install this plugin manually, make sure it is installed in lib/plugins/pwaoffline/ - if the folder is called different it will not work!

Please refer to https://www.dokuwiki.org/plugins for additional info on how to install plugins in DokuWiki.

Copyright (C) Michael Große [email protected]

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

See the LICENSING file for details

BrowserStack is used to live-test the plugin with different Browsers to ensure basic functionality on modern browsers and graceful degradation on IE11.