Modders can upload (to Steam) mods with "about.xml" instead of "About.xml"

[LWM]

This isn't an issue on systems that are case-insensitive, but this causes players on Linux systems to show the mod as being seriously flawed (no name, description, versions, etc).

RimWorld should complain when a player uploads a mod with "about.xml" instead of "About.xml".

Alternately, RimWorld should accept both about.xml and About.xml.