v6.2-beta.1

* Add JVM OOM args to zip distribution scripts.

* Issue **#1866** : Change zip distribution shell scripts to execute from anywhere.

* Issue **#759** : Add GZIP support for `FileAppender` and `RollingFileAppender`.

* Add Elasticsearch integration

* Issue **#2058** : Support authenticating Elasticsearch requests with an API token

* Add ability to provide a custom CA certificate (in PEM or DER encoding) for verifying Elasticsearch connections over HTTPS

* Remove legacy Elasticsearch integration assets

* Add common secret property encryption utils (`CryptoUtils`)

* Add common property `stroom.secret.encryptionKey` for encrypting secrets at rest