[bootlint] Update BootLint to 0.5.0
[checkboxx] Update CheckBox-X to 1.3.0 with fixes for <input type="checkbox"/> with enclosed label (https://github.com/kartik-v/bootstrap-checkbox-x/issues/3)
[checkboxx] Add a setting for 'useNative'. Introduced with bootstrap-checkbox-x 1.3.0
Merge branch 'master' into wicket-7.0.0-M1