Implement new getResourceFiles function

[Xenius97]

Closes #4543

This PR makes possible to list files within a given resource along with specific filtering conditions.

Usage:

getResourceFiles(resource theResource [, bool includeAttributes = false, string filter = "all/map/script/config/file" ]])

iprint(getResourceFiles())
iprint(getResourceFiles(getResourceFromName("cam2rt"), false, "script"))

Important

The client-side function will only be able to see the files that are actually sent to the client.

[Fernando-A-Rocha]

Thank you!
I will use this function for my "new models" resource:

• in meta.xml I have file globs like models/*.dff
• I will use getResourceFiles to find all file paths starting with "models/"
• i will be able to determine if they have the download="false" attribute,
• then perform some logic to store the new models info in a table
• and send the list to clients so they can do downloadFile or access the file directly to load the mod