Add build system with dependency management

[morgenkaffe3]

Add gradle as build system in order to manage dependencies properly.

This also enables us to use Github Actions for running tests and creating artifacts for every major OS.

I had to disable the updater though as it is not compatible with the new architecture yet.

[GodDragoner]

Why Gradle instead of maven?

[morgenkaffe3]

Why Gradle instead of maven?

I kind of was using Gradle lately so I just used it for this too.
Also I kind of prefer the way Gradle configurations work.

And since there was no build tooling in this project yet I didn't really think that you would have a strong opinion on that?
Do you have an issue with Gradle?

On the update logic: I am still working on that. I just had to figure some thing out.

[morgenkaffe3]

@GodDragoner I've finished creating the configuration for update4j now.
For this to work I've used Github Pages. Therefore it would be necessary to have a detached gh-pages branch:

git checkout --orphan gh-pages
git rm -rf .
touch README.md
git add README.md
git commit -m 'initial gh-pages commit'
git push origin gh-pages

Additionally to access this from Github Actions you need to create a personal access token here with the repo permission.

That token must then be entered in the repository settings under secrets. The name must be ACCESS_TOKEN and the value the just generated token.

In order to try this you can download update4j here and run it with:
java -jar update4j-1.4.4.jar --remote https://morgenkaffe3.github.io/TeaseAIJava/releases/update
in an empty directory.

Edit:
I also created a simple Launcher:
https://github.com/morgenkaffe3/TAJUpdater