Remove Gradle suppport

Support for Gradle-based AEM projects has been completely removed with this release.

Fix Gradle artifactory maven build errors

Gradle dependencies will be completely removed in an upcoming release.

6.1.0

• Added @HideDialogField support for classes implementing interfaces (i.e. for overlaying core classes using delegate pattern)
• Updated to only set sling:orderBefore property when value is present.

6.0.0

• Added CoralUI 3 Support
• Added sling:orderBefore support for dialog fields
• Updated commons-compress dependency for security reasons
• Added granite:rendercondition support for tabs/containers
• New @HideDialogField annotation
• Use fixed column layout when no tabs are defined
• Fixed tab layout margin