Update ASM and CFR to support higher Java versions

[Berikai]

I know this project is kinda old but it is actually quite unique in its own way and it is very useful. Because of the ASM version used in the project, it doesn't support newer java versions. So I updated it to the latest one. I also updated CFR decompiler version, removed a deprecated method and updated .gitignore to discard .idea folder which is created by Intellij IDEA IDE and should not be pushed to the repo.