Go full Gradle build

[ultraq]

I've seen some other Eclipse plugins recently that have managed to not use Maven at all for their build! So let's see if I can do something similar here because Tycho is kinda complicated, making me forget everything about how to use it between releases :confused:

Links:

• https://github.com/de-jcup/eclipse-yaml-editor
• https://github.com/diffplug/goomph
• https://github.com/diffplug/gradle-and-eclipse-rcp
• https://www.youtube.com/watch?v=PIC6YeRkRlo

[ultraq]

This is proving a bit tougher w/ Gradle incompatibility issues in the Goomph plugin and me having recently gone Gradle 6 and Java 11 for development. I'll shelve this for now and revisit it another time.

[ultraq]

Have attempted this many times in the last few years, but can never quite get it working 🤷‍♂️ At least it works all good w/ GitHub Actions and the command line now, so I'm less motivated to have this.