[Request] UMG add text justification in vertical

Add to the UMG text justification in the vertical axis (Now only horizontal).
Vertical: (Top, Center, Bottom), Horizontal: (Left, Center, Right)

Added PR https://github.com/EpicGames/UnrealEngine/pull/1138

Since here is the Vertical and the Horizontal boxes you can use with the text, probably this is a useless thing.