Release Notes for 643

Improves startup time for Windows Studio and the game client.

Adds WebP support for thumbnails in the client.

Updates lighting compatibility migration to disable slight bloom on default.

Fixes two issues with InsertService:GetFreeModels() and InsertService:GetFreeDecals():

• Creator name was incorrect for group-created assets. It now returns the group name rather than the user who uploaded the original version.
• After page 0, pages were being skipped. All pages are now returned to match what is shown on Creator Store.

Adds MicroProfiler scopes relating to async light chunk processing.

Fixes Editable Mesh API bug where meshes would not update until part was invalidated.

Fixes missing documentation for Instance.fromExisting in Studio.

Fixes an issue with UIDragDetector where MinMaxDragTranslation jumps at the start of the drag.

Mirrors a fix from the OSS community for the keyof type function asserting when trying to allocate a Union Type with only one component.

Fixes issues with the mobile touch jump button on character death.

Allows more accessories to be accessed from Check Body in Avatar Setup.

Fixed the Mute button in Studio not registering as checked.