Fixes #4615: OpenRA.Utility should expand wildcards in paths

The path to be expanded. It can be a relative or an absolute path.
Wildcards can appear as part of the path and as part of the file name/extension.

Example:

	Expand("./mods/*/mod.?aml");
Merge pull request #5266 from pavlos256/utility-globbing

Fixes #4615: OpenRA.Utility should expand wildcards in paths