up to 2.6.0-RC1

* update to grails-6.2, gradle-8.7
* ship stomp.js instead of webstomp.js
* default to stomp.js without sock.js
* change maven group id (sonatype central publishing)

up to 2.5.0.RC1

up to 2.5.0.M1

- using/supporting grails-4.x (incl. spring-boot-2.x & co.)
- using/supporting gradle-5.x
- bundling webstomp.js (currently in addition to the unmaintained stomp.js)

disable bootRepackage explicitly, bump version to 2.4.1

bump version to 2.4.0, polish readme

bump version to 2.4.0.M1