Zegami-cli

* Some known non-image file extensions will be excluded when ignoring mime type during upload.
* Bug fixes and improvements to collection creation process to support processing optimisations.
* Total upload file size will be reported during collection creation when using verbose flag (-v).
* Warning when uploading files larger than 256MB.
* Bug fixes for deepzoom collection creation.
* Support creating collections without clustering.

* Added support for specifying custom headers when creating imagesets from URLs.
* Improved performance & stability when uploading file imagesets.
* Added support for `image/bmp` files.
* Support for optional automatic column join selection when uploading imagesets.

Pre-release version which includes a faster upload flow among other changes.

internal

Changes

* Add support for Azure-based projects 51

Changes

* Add configuration for Azure Pipelines gating 47
* Fix import on windows with Python 3.8/SQLAlchemy 46