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Start creating tag rooms and carbon copying posts to them based on the tags they contain

See merge request !166

Create room needs just the local part while the directory lookup needs the full alias. Adjust as needed.

Needs to include also the server name.

Also add link to tags stream in topic if configured.

This happens for public posts only. Post author appservice users will be invited to the rooms.

Ensure missing profiles are created on Matrix side

Closes #126 and #127

See merge request !165

Avoids needing to join it.

So Element and other clients that respect tags don't clutter rooms should the appservice user use a client.

Closes #126

We need to register the user via the appservice before going on to the thread room creation later in MatrixRoomMessage.pre_send.

If we try to send a Post to the Matrix appservice, missing profiles need creating.

Closes #127

Emulate Cerulean by creating a thread room for each top level post

See merge request !164

Support images to Matrix

See merge request !163

Refactor up the embedded image recognition code from ActivityPub AttachImagesMixin to the base RawContentMixin so Matrix can use that too to upload images pre sending.

When we get a Markdown source in AP, we prefer that over HTML. Our linkifying of urls however should not be run in this case, we want the markdown to be as it was sent.

Fixes broken images between Socialhome instances.

First parts of the Matrix payload delivery

See merge request !162