Added block.unsearchable smarty plugin back.
Removed content.tpl. Moved the code generation back to Core\Render.
Fixed the Core\Controller and implemented more stuff. WIP
Added possibility to define the js script tag position through smarty's {addJs}
Fixed the plugin UI classes. Both ka.FieldType and ka.ContentType.
Small typo
Fixed `script` tag code generation in Core\PageResponse.
Implemented `setDistributedCache` and `getDistributedCache`. Wrote some phpdoc and
listen now on KernelEvents::VIEW.
Implemented the Core\Render <=> plugin interface.
Added first rough new plugin class. + adjusted its plugin definition a bit.
Implemented some handy methods in Core\Controller.
Adjusted the default content plugin on the start page since the format has changed.