what games are supported?

Working on #219 I couldn't see a list of games that Metamod: Source supports. loader/loader.h gives a good idea but https://wiki.alliedmods.net/Required_Versions_(SourceMod) and https://wiki.alliedmods.net/Supported_Games_(Metamod:Source) both seem outdated.

Anyway, the script in #219 gives the right answer for 11/20 so far with some obviously being wrong and others being a bit more obscure.

Provide feedback