Remove all current deprecations

[codecholeric]

Since we are about to release a new major version we can finally throw out all existing deprecations.

[perlun]

If you're unlucky like me, you might have been using a really-old version like 0.14.1 where methods like JavaClass.namesOf() wasn't even deprecated yet. 😁 This was a bit confusing in the upgrade. Luckily. git clone git@github.com:TNG/ArchUnit.git and looking at the git log -p ./archunit/src/main/java/com/tngtech/archunit/core/domain/JavaClass.java output made it fairly simple to see what the method was replaced with.

(Hint: Use Formatters.formatNamesOf() or look at the diff to see the full details here)

It might even be worth suggesting for people still stuck on the 0.x versions to first upgrade to https://github.com/TNG/ArchUnit/releases/tag/v0.23.1 before attempting the 1.0.x upgrade, since that will highlight all deprecations. That would probably have helped me. 🤔 I didn't realize it until now though.

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(Btw, big thanks for doing your very best to try and apply SemVer correctly! Can't tell you how much that means to me. 🙏 Greatly appreciated!)