vendor LibStub

diff --git a/LibStub/LibStub.txt b/LibStub/LibStub.txt
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+++ b/LibStub/LibStub.txt
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+## APIVersion: 100007
+## Title: LibStub
+## Description: Universal Library Stub
+## Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, ported to ESO by Seerah
+## Version: 1.0 r4
+
+LibStub\LibStub.lua
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diff --git a/LibStub/LibStub/LibStub.lua b/LibStub/LibStub/LibStub.lua
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+-- LibStub is a simple versioning stub meant for use in Libraries.  http://www.wowace.com/wiki/LibStub for more info
+-- LibStub is hereby placed in the Public Domain Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
+-- LibStub developed for World of Warcraft by above members of the WowAce community.
+-- Ported to Elder Scrolls Online by Seerah
+
+local LIBSTUB_MAJOR, LIBSTUB_MINOR = "LibStub", 4
+local LibStub = _G[LIBSTUB_MAJOR]
+
+local strformat = string.format
+if not LibStub or LibStub.minor < LIBSTUB_MINOR then
+	LibStub = LibStub or {libs = {}, minors = {} }
+	_G[LIBSTUB_MAJOR] = LibStub
+	LibStub.minor = LIBSTUB_MINOR
+
+	function LibStub:NewLibrary(major, minor)
+		assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
+		if type(minor) ~= "number" then
+			minor = assert(tonumber(zo_strmatch(minor, "%d+%.?%d*")), "Minor version must either be a number or contain a number.")
+		end
+
+		local oldminor = self.minors[major]
+		if oldminor and oldminor >= minor then return nil end
+		self.minors[major], self.libs[major] = minor, self.libs[major] or {}
+		return self.libs[major], oldminor
+	end
+
+	function LibStub:GetLibrary(major, silent)
+		if not self.libs[major] and not silent then
+			error(strformat("Cannot find a library instance of %q.", tostring(major)), 2)
+		end
+		return self.libs[major], self.minors[major]
+	end
+
+	function LibStub:IterateLibraries() return pairs(self.libs) end
+	setmetatable(LibStub, { __call = LibStub.GetLibrary })
+end
+
+LibStub.SILENT = true
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