gnusocial.rocks/v3/updates-improve-the-attachm...

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Updates: Improve the Attachments system
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With the milestone [Port Media system from
v2](https://www.gnusocial.rocks/v3/milestone-port-media-handling-from-v2.html) we had ported the existing
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attachment system. The fact is that this system wasn't good enough.
It's always important to start with the original code as that allows us
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to review past decisions and understand all the corner cases previously
considered.
Sadly, what motivated us to re-design the attachment system were the
non-considered corner cases. In particular:
* Remove `title` from attachment, as it's part of the relation between attachment and note.
* Remove `actor` from attachment, many actors may publish the same attachment.
* Remove `is_local` from attachment, as it's part of the relation between attachment and note.
* Remove `remote_url` from attachment, different urls can return the same attachment.
* Attachment now has a reference counter
* Add entity GSActorToAttachment
* Add entity GSActorToRemoteURL
* Add entity RemoteURL
* Add entity RemoteURLToNote
* Add entity RemoteURLToAttachment
* AttachmentToNote now has a title attribute
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Key commits:
* [32ad5dbd74 - [ENTITY] Split Attachment in various new entities](https://code.undefinedhackers.net/GNUsocial/gnu-social/commit/32ad5dbd74ebb369c4b3ed688e1fb78464fabe49)
* [c381e58d33 - [ENTITY] Refactor RemoteURL entities to Link](https://code.undefinedhackers.net/GNUsocial/gnu-social/commit/c381e58d3307e7dd07abeb9cf5b3998e34f5bd48)
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The structural changes and how it compares to v2 is detailed in our
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[wiki](http://agile.gnusocial.rocks/doku.php?id=attachment).
Some relevant observations:
- `Link` is now part of GNU social Data Representation terms. It represents
any remote URL being shared in a note.
- There's only one fixed directory for GSFiles.