start refactoring the mediabrowser to use the Infopark JavaScript search API
mediabrowser: don't load on scroll anymore

+ major refactoring to get rid of defaults and having less exceptions in
the way the code is organized
render default icon if no filter icon is given
load filter from options
don't render the loading animation if no query is given
search only in active filter
configure a list of available lists outside of the media browser

+ handles filter names and fetches the appropriate filter
bugfix: return the search result format correctly
bugfix: create a correct image type
adopt all editors and views to use the new filter syntax
update generators
Merge branch 'feature/mediabrowser' into develop

* feature/mediabrowser:
  update generators
  adopt all editors and views to use the new filter syntax
  bugfix: create a correct image type
  bugfix: return the search result format correctly
  configure a list of available lists outside of the media browser
  search only in active filter
  don't render the loading animation if no query is given
  load filter from options
  render default icon if no filter icon is given
  mediabrowser: don't load on scroll anymore
  start refactoring the mediabrowser to use the Infopark JavaScript search API