Bugfix for permanently disabled Plugins

* Plugins with the "@general/disabled" flag set to 'true' were not disabled. This is fixed now! :-)
First Ajax Topic posting. Yeah! Misc improvements.

* Added a "ajax-post-writing" Plugin
* Switched the "debug" mode of our core app JS files to "false"
* Some tweaking here and there
* Added a "less" task to our app gulpfile
* Added LESS to our Dockerfile
Added "LiveReload" port to Dockerfile container init sample
Added missing database files from old "master" branch
phpBB import page now use HTML hooks to activate its JS components
We now keep session flashes when using Ajax simple redirect
Bugfix in "sign-in" process
JS cleaning

* Switched off the "myDebug" flag of our core Plugins
* Optimizations on our "components-factory" Flight Component
* TIny update to "requirejs-config.js"
We now have a full "à la Gmail" Topics writing interface. Yeah!

* We have a "fullscreen" & a "minimize" behaviours
* CSS styling of the #ajax-writing-widget is now fully handled by the Theme, instead of having a few properties in the "ajax-post-writing" Plugin
* Added some granularity in our test TWBootstrap Theme gulpfile watching operations
Added a "app.view.rendering_done" boolean to app vars. May be useful...
PHP CS Fixer is unleashed!

...and he's angry, with so much work to do
JSHint fixes
First Ajax Post posting. Yeah!
Merge branch '003-a-la-gmail-post-writing'

closes #3