OpenRA/OpenRA — pull request #4331 by pchote (2013-12-19 01:46:56+00:00)
Title: Allow mods to define a list of compatible map sources. 

Fixes #4319.

A worked example:
````
MapFolders:
./mods/cnc/maps
~^/maps/cnc
./mods/fgtn/maps

SupportsMapsFrom: cnc
````