Paper support

[osipxd]

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.

Repositories

Repositories was moved to extension functions: spigot, sk98q, destroystokyo, dmulloy2, md5, vault, placeholderapi.

For example. To add dmulloy2 repo you should write:

repositories { dmulloy2() }

Checklist:

• Have you read text of project license?
• Have you described maked changes in README or wiki?
• Have you added changelog?

[codecov]

Codecov Report

Merging #16 into develop will decrease coverage by 5.44%.
The diff coverage is 15.6%.

@@ Coverage Diff @@ ## develop #16 +/- ## ============================================= - Coverage 40.32% 34.87% -5.45%  - Complexity 72 75 +3  ============================================= Files 18 19 +1 Lines 367 453 +86 Branches 44 59 +15 ============================================= + Hits 148 158 +10  - Misses 202 277 +75  - Partials 17 18 +1

Impacted Files	Coverage Δ	Complexity Δ
.../endlesscode/bukkitgradle/server/ServerCore.groovy	3.61% <0%> (-2.33%)	2 <0> (ø)
...endlesscode/bukkitgradle/BukkitGradlePlugin.groovy	86.95% <100%> (-2.7%)	6 <1> (ø)
.../endlesscode/bukkitgradle/util/Dependencies.groovy	90.9% <100%> (+0.9%)	3 <0> (ø)	⬇️
...ode/bukkitgradle/extension/RunConfiguration.groovy	29.41% <20%> (-1.63%)	5 <0> (ø)
.../endlesscode/bukkitgradle/util/Repositories.groovy	66.66% <66.66%> (ø)	3 <3> (?)
...ru/endlesscode/bukkitgradle/DevServerPlugin.groovy	76.19% <66.66%> (ø)	1 <0> (ø)	⬇️

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