20-08-2021 release

Fixed:

• basic auth header hash for rest auth computed correctly;
• urls in history didint clicable sometimes;
• buttons in batch view now work well;
• url`s of backend in query now work fine;
• you can send messages inside subprocess now;

New:

• feature to disable load of counters of process, greate for huge installation
• feature to define type of variable, when you search in history
• link to instance in incident view
• feature to see and retry external task in detail process instance view;