v6.0-beta.22

* Issue **#1053** : Add API to disabled authorisation users

* Issue **#1042** : Improve error message for an ApiException when requesting a user's token.

* Issue **#1050** : Prevent creation of permission entries if key already exists.

* Issue **#1015** : Add sortDirections[] and keySortDirection to visualisation data object to fix sorting in the visualisations.

* Issue **#1019** : Fix visualisations settings dialog so you can un-set text and list controls.

* Issue **#1041** : Add a healthcheck to Stroom to alert for API key expiry

* Issue **#1040** : Fix for visualisations that do not require nested data.

* Issue **#1036** : Fix for scrollbar position on explorer popup windows.

* Issue **#1037** : Updated `moment.js` for parsing/formatting dates and times.

* Issue **#1021** : Dashboard links now allow `{}` characters to be used without URL encoding.

* Issue **#1018** : Added Health Checks for the external connectors that are registered via plugins

* Issue **#1025** : Fixed ACE editor resize issue where horizontal scroll bar was not always correctly shown.

* Issue **#1025** : Updated ACE editor to v1.4.2.