Adds new capabilities to the enhaced tooltip system to support this:
- Can now create enhanced tooltips for menu items created with `AddMenuEntry`, using tooltip localization IDs as excerpt names
- Bulleted lists and numbered lists now render with a hanging indent (using a horizontal box with two slots)
- Can share content between two tooltips using the new `[VAR:ExcerptAlias]` variable.
#jira UE-142156
#preflight 630f8b10e352708d4446bc89
#rb lauren.barnes
[CL 21722781 by Robb Surridge in ue5-main branch]