• Custom Path interface
• Origin#listAll should be more descriptive, specific
• Reader (with encoding) complementing the InputStream

Extract abstract class (in order to set the pattern etc)

As mentioned in MAGNOLIA-6126 too, if we use Builders, we should then specify pathPattern there, and remove the #start(Pattern) method from the interface.
FileResourceLoader could actually also be an Origin, we could well merge the two interfaces.