WUI: Updated GWT source level to Java 11 (!141) · Merge requests · Perun / Perun IdM / perun-wui · GitLab

Jednotné přihlášení test requested to merge github/fork/zlamalp/java11 into master Jan 20, 2021

Created by: zlamalp

Updated source level of all modules to Java 11.
Use custom Jetty version to run super-dev mode, since some library has uncompatible ASM version when build on Java 11.
Include Jetty 9.4 dependency.
Updated all maven plugins to their latest version.