flow-14.2.2

• vaadin dependencies have now scope provided to avoid clashes with user project version
• vaadin-flow-sockjs is now an optional dependency. It must be explicitly defined when using PUSH. For better compatibility with Vaadin version in use the classifier `vaadin-${vaadin.version} can be specified.
• Fixed execution on access command to run on vertx context
• Fixed resource resolution on startup context
• Invoke synchronous start and stop verticle methods
• Upgraded sockjs-client to 1.4.0
• Fixed default scheduler delay (thanks to Dudeplayz)