This is probably super ugly Go code, but it works.

Fixes https://github.com/turt2live/matrix-media-repo/issues/312

Fixes https://github.com/turt2live/matrix-media-repo/issues/268

Fixes https://github.com/turt2live/matrix-media-repo/issues/265

Also fixes an issue with apng thumbnails being cropped in multiplying ways.

This should help memory some more. See https://github.com/turt2live/matrix-media-repo/issues/237

Theory is that by dumping the streams we'll relieve any bytes held on by the S3 libraries. 

Might reduce memory usage over time

Fixes https://github.com/turt2live/matrix-media-repo/issues/223

Part of https://github.com/turt2live/matrix-media-repo/issues/209

Part of https://github.com/turt2live/matrix-media-repo/issues/209

Fixes https://github.com/turt2live/matrix-media-repo/issues/187

Fixes https://github.com/turt2live/matrix-media-repo/issues/170

There's some other functions which still need some work in order to fully complete the upload process

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

Fixes https://github.com/turt2live/matrix-media-repo/issues/130

Fixes https://github.com/turt2live/matrix-media-repo/issues/131

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

Fixes https://github.com/turt2live/matrix-media-repo/issues/122

The original error was a corrupted file served over federation to us which caused format exceptions.

**Caution**: This is a major migration that changes how files are tracked within the database. Although tested to ensure things won't go wrong, there is the possibility of something going haywire. It is recommended to run the following database commands before upgrading:

CREATE TABLE media_backup AS TABLE media;
CREATE TABLE thumbnails_backup AS TABLE thumbnails;

In the event you need to roll back, run the following:
DROP TABLE media;
DROP TABLE thumbnails;
CREATE TABLE media AS TABLE media_backup;
CREATE TABLE thumbnails AS TABLE thumbnails_backup;
DELETE FROM gomigrate WHERE migration_id = 7;

This will cause any files uploaded between upgrading and rolling back to be lost.

NOTE: The migration will take a while and runs on the first access of a file. If you have a lot of files, this could take a while.

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Fixes https://github.com/turt2live/matrix-media-repo/issues/106
Step towards https://github.com/turt2live/matrix-media-repo/issues/47

Part of #58

Part of #58

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

Part of #58

Fixes #32