GH-438 Bukkit OfflinePlayer argument

[BlackBaroness]

Hi!

I improved LiteBukkitFactory by adding build(Plugin) method, Plugin bind and exposing Plugin->fallbackPrefix algorithm to public.

I added a very useful OfflinePlayer argument resolver. This time, a made it more smart that it's previous generations: now it checks and warns if called synchronously, as I noticed a lot of problems when using that in sync - this could not occur at testing time but sometimes just freezes the server in production, so we should prevent that softly.

Also, now it collects as many nicknames as possible by caching player names, so suggestions should be much more useful than just Server#getOnlinePlayers.

Feel free to edit / request changes, as my style might be different from yours.

Also, I would be happy if you would make a release after merging that, so we can start using it. Thank you!

[Rollczi]

Hi!

Thanks for the improvements! I will introduce a small adjustment and release it in version 3.6.1.