Fireballs are now treated as projectiles.
Apparently this has existed for a few years now. Don't even ask.
Fixes WORLDGUARD-3611, WORLDGUARD-3476.
Potentially fixes lots of other issues with fireballs as well.
Other settings and so on seemed to have covered a lot though. (a7c202 by wizjany)
Fix checkstyle for legacy module. (ec08d7 by wizjany)
Gradle-ize. Prep for Sponge.
Old Bukkit code can still be found in the worldguard-legacy folder
and built with `gradle worldguard-legacy:build`. Hopefully nothing
got lost in the gradle-ization. (3d5ee7 by wizjany)