Remove IDE/user configuration specific stuff

[TuxCoding]

I removed all the user configuration specific stuff, because every time a users chooses a different IDE other than Idea, they have to exclude their IDE dependent files exclusively.

But the bigger issue I think is the IDE configuration. Some users could have a different project configuration and then these changes will be automatically included. This also applies your test server setup. In my case I created a shared test server folder. Easier to update and can be automated too. But then there are other configurations like a activating bungeecord or not too. So I think it's better to exclude this folder too.

This should also make the repo smaller for future commits and additions, because there shouldn't be any binary files except the gradle wrapper.

[michael1011]

Thank you! @games647