Add info_portal_gamerules

[JJL772]

This should be merged after the internal PR is.

[TeamSpen210]

Note that file isn't meant to be directly edited, instead you use dumpentityfactories, so we can see entities only in the FGD but not ingame, or vice versa.

[braem]

Note that file isn't meant to be directly edited, instead you use dumpentityfactories, so we can see entities only in the FGD but not ingame, or vice versa.

Oh! News to me. Thanks spen!

[JJL772]

I added it to the end of the factories, in a different PR I'll add the dumped version from the game since there are quite a few changes in it.

[braem]

Is this blocked by something or good to go?