Fixes https://github.com/turt2live/matrix-media-repo/issues/116

Fixes https://github.com/turt2live/matrix-media-repo/issues/190

Fixes https://github.com/turt2live/matrix-media-repo/issues/183

Per [MSC2278](https://github.com/matrix-org/matrix-doc/pull/2278)

Fixes https://github.com/turt2live/matrix-media-repo/issues/200

Fixes https://github.com/turt2live/matrix-media-repo/issues/180

To be expanded further.

Fixes https://github.com/turt2live/matrix-media-repo/issues/169

Fixes https://github.com/turt2live/matrix-media-repo/issues/167

Another step forwards to having different storage backends. s3 uploads currently not implemented

Part of https://github.com/turt2live/matrix-media-repo/issues/65

It's a stable endpoint

Fixes https://github.com/turt2live/matrix-media-repo/issues/105

Due to updates in the proposal: https://github.com/matrix-org/matrix-doc/issues/1232

The middle layer is being completely replaced. We're keeping it for reference for now though.

Part of #58

This is a hacky fix, but it works well enough. Fixes #102

This is currently an unstable endpoint, but for the purpose of client validation it's been implemented here.

Reference issue: https://github.com/matrix-org/matrix-doc/pull/1189

This is based upon the behaviour described in the Google Doc proposal (see issue) as of writing.