v7.0-beta.6

* Add default for stroom.security.authentication.durationToWarnBeforeExpiry

* Fix missing icons for Kafka Config and Rule Set.

* Fix Kafka Config entity serialisation.

* Issue **#1264** : Dashboards running in embedded mode will not always ask for the user to choose an activity if the users session has one set already.

* Issue **#1275** : Fixed permission filtering when showing related streams.

* Issue **#1274** : Fixed issue with batch search caused by Hibernate not returning pipeline details in stream processor filters.

* Issue **#1272** : Fixed saving query favourites.

* Issue **#1266** : Stroom will now lock the cluster before releasing owned tasks so it doesn't clash with other task related processes that lock the DB for long periods.

* Issue **#1264** : Added `embedded` mode for dashboards to hide dashboard chrome and save options.

* Issue **#1264** : Stroom no longer asks if you want to leave the web page if no content needs saving.

* Issue **#1263** : Fixed issues related to URL encoding/decoding with the `dashboard()` function.

* Issue **#1263** : Fixed issue where date expressions were being allowed without '+' or '-' signs to add or subtract durations.

* Add fallback config.yml file into the docker images for running outside of a stack.

* Issue **#1263** : Fixed issues related to URL encoding/decoding in dashboard expressions.

* Issue **#1262** : Improved behaviour of `+` when used for concatenation in dashboard expressions.

* Issue **#1259** : Fixed schema compliance when logging failed document update events.

* Issue **#1245** : Fixed various issues with session management and authentication.

* Issue **#1258** : Fixed issue affecting search expressions against keyword fields using dictionaries containing carriage returns.