CA and CDI support for manifest resources

[ElektroKill]

Add support for reading and writing Custom Attributes and Custom Debug Infos for manifest resources.

[ElektroKill]

I've implemented reading in the best way I could think of that matches the implementation for other members and doesn't introduce any API changes except for the fact that EmbeddedResource, AssemblyLinkedResource, and LinkedResource are no longer sealed due to inheritance being required by the MD variants of them. If there is any way to prevent the non-internal inheritance of a class in this particular case I would be willing to hear about it and implement it.

[wtfsck]

If there is any way to prevent the non-internal inheritance of a class in this particular case I would be willing to hear about it and implement it.

I don't think it's possible so nothing to do about it.

Have you tested this with some assembly that has resources with CAs and/or CDIs?

[ElektroKill]

Yes I have indeed tested this by loading an assembly with resources with dnlib, adding a custom attribute to one of the resources, writing to disk, loading this newly written assembly and checking if the custom attribute is present.