[DMN Designer] Implement new UX for downloading model assets ------------------------------------------------------------ Key: DROOLS-4355 URL: https://issues.jboss.org/browse/DROOLS-4355 Project: Drools Issue Type: Task Components: DMN Editor Reporter: Guilherme Gomes Assignee: Guilherme Gomes Priority: Major Labels: drools-tools Fix *_Download buttons_* UX following these guidelines: https://issues.jboss.org/browse/DROOLS-4315 This JIRA comprehends the following tasks: - Remove stunner default download button; - Remove KIE editor default download button; - Create the the new download button following UX input; - Remove the Documentation download button.