Add pattern support for `about_resource` field?

[chinyeungli]

Now we are using patterns to map to deployed resource paths, and this is also different from the about_resource field in the ABOUT spec as this is resources in the deployed side, and not present side-by-side in the devel codebase. We are currently using about_resource temporarily to have these patterns, until this spec change is accepted. But this is incorrect both because of the above reason, and that the about_resource spec does not support patterns for now.

#539 (comment)

@pombredanne @AyanSinhaMahapatra

What’s the current status, and what plan/change needs to be made?
At present, the about_resource field is designed to reference a single resource (file or directory) at a time.

Should we introduce a new field to support patterns for about_resource on the deployed side, or should we extend the existing about_resource field to include pattern support