Test the possibility to replace JD-CORE by CFR - another java decompiler

[Moacir da Roza Flores]

Since CFR is updated more frequently than jd-core, maybe will be better use cfr than jd-core:

https://www.benf.org/other/cfr/

1. Check possible license problems
2. Create a POC.

[Moacir da Roza Flores]

I receive permission to use CFR from the creator, so i'm working on it.