Исрапил Ахмедов

"Fix" #602

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### Purpose and Effect of This Pull Request Fix #602 ### Testing I don't know how to call a mistake, test it.

Make Nukkit more kotlin friendly: Commands

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**Why not lombok.NonNull?** I hate lombok and believe it can be removed from project)) Before: After:

Add bookmarks to mark code sections. It will be very convenient, go over the bookmarks, because the code is very long, there are no classes. Sorry for the bad english....