Support OpenJDK java

[tvdler]

Oracle seems to be winding down their java support, and supposedly ending it. It would be much easier to use OpenJDK to run filebot, especially in linux.

[rednoah]

Yes. So what's not working?

FileBot requires Java SE 8. I don't care if it's the Oracle build, or an OpenJDK build (which is pretty much the same thing anyway).

[tvdler]

IIRC it used to require Oracle java? It seems to work fine without it now, thanks!