Allow TextStrokeColor to be set with SetCore ChatMakeSystemMessage

StarterGui:SetCore("ChatMakeSystemMessage") is used to create a system message to display in a player’s chat. However, at the moment the only properties supported by it (according to the wiki) are: text, textcolor, font, fontsize.

I’m requesting that a StrokeColor property is added, as developers are severely limited with the forced default black stroke.