Mod Manager

This update is mainly here to rework the compatibility system but also provides some other new stuff.

Now, everyone will be able to play any mod, even outdated ones.
Some older mods like for example the Harry Potter mod or the Thanos mod may make their comeback soon thanks to this functionality 🙂

Other changes:

• Icons have been reorganised. The entire link is no longer visible. Instead, there is an "i" icon allowing you to access the same page.

• For each mod with an official discord server, it's now possible to join it directly through Mod Manager.

• Some icons have been replaced (discord, favourite, ...).

• Many fix for some visual or minor bugs.