Patch 8.2.0/API changes

Blizzard UI post:
* 
* 8.2 UI patch notes: https://www.wowinterface.com/forums/showthread.php?t=57226
Diffs:
* 8.1.5 (29981) to 8.2.0 (30920): https://github.com/Gethe/wow-ui-source/commit/f1462fb3976c275e36939507147a0fbba3a30640
* 8.2.0 (30948): https://github.com/Gethe/wow-ui-source/commit/295545e959e82b9fa43a4cdab4afb80a3b13b02b
* 8.2.0 (30993): https://github.com/Gethe/wow-ui-source/commit/9eb7d56d256e5b2e20682e4d40f72378e483ea2c
* Resources: https://github.com/Ketho/BlizzardInterfaceResources/commit/b64b55d7917d7552dda675865210ec404e3ea848
==API==
====Changes====
* The TOC version is 80200
* No files outside of Interface\ can be addressed by file path anymore
:* () will no longer work for non-interface file paths. TSquare 2019-04-23. IRC #wowuidev
:* Paths to Fonts\ are still accessible for FontInstance:SetFont()
:* Sounds cannot be replaced anymore by dropping a sound file in the Sound\ folder, but they can still be (un)muted with () and ().
* () and () were protected to prevent automating reports, addons have to use () now. TSquare 2019-04-24. IRC #wowuidev
* Nameplates anchoring is now restricted to only those in the same anchor "family". This was done to disable drawing lines to nameplates. TSquare 2019-05-16. IRC #wowuidev
* GameTooltip:AddTexture() now supports multiple customizable textures per line.
* The WorldStateFrame widget functionality was replaced by the UI Widget Manager API.
* () and () are now protected, they can no longer be called by addons while in combat.
* /fstack doesn't show the global frame names anymore unless disabling the CVar.
* Deprecated API: Blizzard_Deprecated 8.2.0
 
 
 Global API 8.1.5 (29981) → 8.2.0 (30948)
112 new functions	10 removed functions
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==Widgets==
 Widget API 8.1.5 (29981) → 8.2.0 (30918)
9 new methods	6 removed methods
: Animation:SetPlaying
: AnimationGroup:SetPlaying
: Checkout:CopyExternalLink
: Checkout:OpenExternalLink
: Frame:DesaturateHierarchy
: GameTooltip:SetAzeriteEssence
: GameTooltip:SetAzeriteEssenceSlot
: TabardModel:GetLowerEmblemFile
: TabardModel:GetUpperEmblemFile	
: Browser:ClearCache
: Browser:HasConnection
: Checkout:ClearRenderSize
: Checkout:SetRenderSize
: RENAMED TabardModel:GetLowerEmblemFileName
: RENAMED TabardModel:GetUpperEmblemFileName
 Widget Handlers 8.1.5 (29981) → 8.2.0 (30918)
6 new handlers
: Checkout:OnButtonUpdate
: Checkout:OnEditFocusGained
: Checkout:OnEditFocusLost
: Checkout:OnError
: Checkout:OnEscapePressed
: Checkout:OnExternalLink
==Events==
 Events 8.1.5 (29981) → 8.2.0 (30918)
28 new events
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==CVars==
 Console variables 8.1.5 (29981) → 8.2.0 (30948)
13 new cvars	4 removed cvars
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 Console commands 8.1.5 (29981) → 8.2.0 (30918)
4 new commands	1 removed command
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==References==