Java 8 Support

[NotGeri]

There were a few missing pieces to support Java 8:

1. Without using the --release 8 flag, we missed some new language features which error at runtime
2. Some packages conflict with older Spigot/Paper versions, so we need to relocate them
3. After fixing the first point, the unsafe reflection logic does not build correctly. ATM, I could not find a better way, such as how Velocity lets you swap out the channel, so we just skip Waterfall for this flag. All of our runtime Java versions will work with this fine.
   More info: https://github.com/Bloom-host/Issues/issues/55

This should allow 1.8.x - 1.20.x and Java 8 - Java 17 support