Patch 9.2.0/API changes

==Summary==
* New Feature: Click Casting - allows you to cast spells by simply clicking on a unit frame.
* New Setting: Unit Frame Mouseover Casting - allows you to mouse over a unit frame and cast a spell on that character without targeting them.
* Supports setting the Gamepad LED color.
* Supports "Notch Aware" UI for MacBook Pro systems.
* Added Cosmic spell school.
* Removed raid target icons 9-18.
==Resources==
* TOC: 90200
* Diffs: wow-ui-source, BlizzardInterfaceResources
* Deprecated API: Deprecated_9_2_0.lua
* Official patch notes: User Interface and Accessibility
* Community patch notes: 9.2.0 Consolidated UI Changes
==Global API==
 9.1.5 (41031) → 9.2.0 (42521) Feb 25 2022
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==Widgets==
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==Events==
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==CVars==
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: BeckonTriggerEventlogDefault: 0
: CMAA2ExtraSharpnessDefault: 0Set to 1 to preserve even more text and shape clarity at the expense of less AA
: CMAA2QualityDefault: 2CMAA2 Quality Level. 0 - LOW, 1 - MEDIUM, 2 - HIGH, 3 - ULTRA
: enableMouseoverCastDefault: 0, Scope: CharacterWhether mouseover casting is enabled (optionally with a modifier key).
: GamePadFactionColorDefault: 1Enable setting GamePad's led color to match current faction
: NotchedDisplayModeDefault: 1Do nothing = 0. Shift UI down = 1. Shift everything down = 2.
: telemetryTargetPackageDefault: Blizzard.Telemetry.Wow_MainlineThe Package we want to send telemetry to e.g. Wow_Mainline or Wow_Classic
: Commands
: spectateSpectate <CharName-Realm> - Begin commentator view of specified player's instance party. Exclude name to exit spectator mode