keep inputstream source when genrating from the plugin

[glelouet]

Instead of getting a stream of inputstream, we also get their source information, if any.

That source information is transmitted down to the generators, so they can use it, eg to deduce class name based on the file.

It is also printed on error, to know which file / url generated the issue.

[glelouet]

sorry, should be draft, I realize the pair is not transmitted to the generator which could use that information

[glelouet]

I made a PR rather than a discussion for this one. The reason is that I was thinking how to do that before, and how it could help the generators.

[phax]

I have the concept of IReadableResource in my ph-io base library - with ClassPathResource, FileResource and URLResource with the sanity methods for InputStream and Reader - please have a look

[glelouet]

Can't find the repo. Can you link @phax ?
Or better, change the PR to incorporate your idea instead.

[phax]

@glelouet start from https://github.com/phax/ph-commons/blob/master/ph-io/src/main/java/com/helger/io/resource/ClassPathResource.java