TotalFreedomMod uses JDK 8 functionality

[JeromSar]

Namely: java.util.function.Function is used.

Original issue: #2147

[Wild1145]

So this was on the 1.12-Alpha branch, which does require JDK 8 to compile, simply because that is what I had at the time to work with and it seems to work most places. If we need to revert support back to JDK 7 as well then that can be done, just not sure if we need to support JDK 7 or not, though probably a good idea really.

[Wild1145]

Closed as we've moved from 1.7 to 1.8.