v0.8.0 - Paper support

Paper

Now you can choose bukkit.run.core. It can be spigot or paper.
Also added task :downloadPaperclip to download paperclip (wow! unexpected).
To host paper versions build was created this gist.
Added function paperApi() to include Paper as dependency.

Other

• Automatically BuildTools download and update
• Dependencies applies repos that needed for them

Read updated README for more information.