First release from the new organization!

• Enable support for newer versions of IntelliJ (v2021.1 and greater)
• Based on intellij-platform-plugin-template (new Gradle build spec)
• Support Lamdera projects
• Support elm-review
• Improved navigation and UI for compiler and elm-review Toolwindows with correct IntelliJ appearance setting (light, dark, ...)
• Support multiple Elm-main entry points (compile all)