Changed: Bring back full and partial UI view internally, we might use it in the future to fix HUDs at the top going behind the UI.

Fixed: Face selection info in Tools window.
Fixed: Minor layout inconsistencies in Tools window.

Fixed: Added Missing create "Material" menu entry in Inventory.

Added: "Custom" location to Next Login Location to show the user when a custom choice was made.

Fixed: Enabled all pie menus to properly benefit from enabling/disabling Sit/Stand slices depending on context.

Changed: Shift around some login progress and space out Wearable Wait a bit to give the user less the impression that the Viewer is hanging/freezing.

Changed: Make Viewer more responsive during login inventory skeleton creation, show progress to the user.

Cleanup. Caused by a merge of main(D567) into D559

SL-20450: Fix missing LSL keyword INVENTORY_MATERIAL