The original voxelsniper plugin hasn't been updated for a few years but I believe there's a new version maintained but somebody else on spigot, this is what I found: Fast Async Worldedit & VoxelSniper. I'm sorry if that's incorrect, I kept getting a 502 error when I tried to go on spigot's website.
Hey, just some advice from a fellow programmer, Lua is very uncommon for use in minecraft. If you have the basics of programming down then you should be able to pick up Java fairly quickly. Java is the primary programming language for mod and plugin creation in minecraft. Best of luck friend!