Frontend refactoring

Created by: sunsetter

• frontend-asset-handling

  • introduces Asset-Handler with lib-function for webjar-Assets
  • lessifies all css-dependencies so that they get distributed as one (optimized) css (rewrites relative urls)
  • cleans up layout.scala.html, stylesheet import reduced to two css-link-tags and javascript is fetched from webjars
  • introduces _asset and _assetWebjars templates to provide versioned asset-Url including configured cdn prefix (if present)

• fixing appearance and versions

  • adds translation for untranslated strings
  • adjusts datatables for users
  • fixes small layout-issues
  • icon-handling works as before

• bootstrap-layout for datatables

  • fixing layout of datatables by including manual adjustments to datatables as js-file.
  • adjusting initObject to use bootstrap layout for pagination

• fixing interface glitches

  • image-uploads provide relative url to /assets now to be able to use CDN
  • deleteDBData now works also in InnoDB by disabling foreign_key_checks during delete
  • fixes tinyMCE integration
  • fixes imageUpload via tinyMCE add (old legacy) bootstrap-datetimepicker into layout and remove webjar-version (dit not work)

• PLAY-16 version increment