Kwcoco

Added
* Add `role` property for annotations in the schema.

Fixed
* Added `instance_id` for mmlab tracking
* Fixed np.bool
* Fixed np.float

Added

* Initial support to conform to mmlab coco specs
* Added ability to specify resolution in `CocoImage.delay`
* Add resolution to the image / video schema.


Fixed
* kwcoco validate now reports errors for all inputs


Changed

* Modified signatures of `annots` and `images` to use `annot_id` and `image_id`
instead of `aid` and `gid`.

* Removed mentions of "flicks" in timestamps. We are simply using ISO strings
and unix times for now.

* Updated timestamp details in the SPEC.

* Updated descriptions and organization in the formal schema.

* Require that names do not contain the "/" character in the formal schema.

Added
* Initial support for PostgreSQL
* In CocoDataset.coerce the arg `sqlview` can now be given as a string `sqlite` or `postgresql`.


Fixed
* Lookup on SQL database now handles json columns

Fixed
* Taking non-existing channels from a single-image delayed node returns a
concatenated node with existing and nan channels.

Changed
* Taking subchannels from a concatenated delayed node now groups discontinuous
indices from the same underlying image.
* `channel_spec`, `sensorchan_spec`, `util.lazy_frame_backends`, and
`util.delayed_ops` have all been ported to the new `delayed_image` package.

Removed
* Removed old `util_delayed_ops`

Fixed
* Fixed bug in vidshapes toydata code
* Respect masked arrays when doing delayed warp

Changed
* Handle change in kwimage demo data, doctest hashes changed
* The SQLView changed the "extra" key to "__unstructured__" and now implicitly
removes it before being passed to the user.
* The multisensor data now contains a "sensor" key in the image dictionary.
* Can now pass `kwcoco.CocoDataset.coerce` `sqlview=True` to attempt to grab an SQL view of the dataset.

Fixed
* bug in coco subset when absolute=False