WORLDEDIT-3651 - Reported by JamesYeoman

I use Intellij with SonarLint + SonarCloud and as a result, I get warned about issues such as the InputStream on line 730 of com.sk89q.worldedit.WorldEdit never being closed. It also can be configured to warn about the code complexity(nested logic statements) exceeding a certain threshold. I just think that it would be beneficial for the quality of the code to use some sort of code-analysis at some point in the pipeline.