Iris-grib

This is a **minor** release of `iris-grib`, which is available on [conda-forge](https://anaconda.org/conda-forge/iris-grib?version=0.19.0&channel=main) and [PyPI](https://pypi.org/project/iris-grib/0.19.0/).

What's Changed
* Mergeback 0.18.x branch to main by lbdreyer in https://github.com/SciTools/iris-grib/pull/294
* Transverse Mercator support negative scanning by trexfeathers in https://github.com/SciTools/iris-grib/pull/296
* Update lock-file and tests by trexfeathers in https://github.com/SciTools/iris-grib/pull/299
* New GRIB-CF mappings by trexfeathers in https://github.com/SciTools/iris-grib/pull/297
* Use reusable workflow for refresh lockfile job by lbdreyer in https://github.com/SciTools/iris-grib/pull/304
* Correct location of reusable workflow repo by lbdreyer in https://github.com/SciTools/iris-grib/pull/307
* Drop use of shapeOfTheEarth for Grib 1 by lbdreyer in https://github.com/SciTools/iris-grib/pull/316
* Correct bounded forecast period calculation by s-boardman in https://github.com/SciTools/iris-grib/pull/322
* standardize requirements structure by bjlittle in https://github.com/SciTools/iris-grib/pull/327
* Convert gribapi to eccodes by s-boardman in https://github.com/SciTools/iris-grib/pull/325
* use workflows version for refresh-lockfiles ci by bjlittle in https://github.com/SciTools/iris-grib/pull/331
* NEP 29 changes - py39 minimum by trexfeathers in https://github.com/SciTools/iris-grib/pull/339
* alter calculation of offset by david-bentley in https://github.com/SciTools/iris-grib/pull/287
* Update README.rst by pp-mo in https://github.com/SciTools/iris-grib/pull/281
* Add loading+saving for non-supported fixed surfaces by lbdreyer in https://github.com/SciTools/iris-grib/pull/318
* Relicense from LGPL-3 to BSD-3 by lbdreyer in https://github.com/SciTools/iris-grib/pull/359
* replace deprecated `eccodes-python` PyPI package with new `eccodes` in core requirements by valeriupredoi in https://github.com/SciTools/iris-grib/pull/357
* Drop deprecated distutils.version for packaging.version by bjlittle in https://github.com/SciTools/iris-grib/pull/360
* Auto-generate zero data for missing data payload by bjlittle in https://github.com/SciTools/iris-grib/pull/362
* bump feature branch to release version 0.19.0 by bjlittle in https://github.com/SciTools/iris-grib/pull/364

New Contributors
* s-boardman made their first contribution in https://github.com/SciTools/iris-grib/pull/322
* david-bentley made their first contribution in https://github.com/SciTools/iris-grib/pull/287
* valeriupredoi made their first contribution in https://github.com/SciTools/iris-grib/pull/357

**Full Changelog**: https://github.com/SciTools/iris-grib/compare/v0.18.0...v0.19.0

Changes summary:

* Drop Python 3.7 support
* Various updates to get it working with the latest versions of Iris, eccodes, cftime, cartopy and proj (288)

See "What's new in iris-grib v0.18.0" [iris-grib 0.18.0 release notes](https://iris-grib.readthedocs.io/en/v0.18.0/ref/release_notes.html)

Changes summary:
* Remove iris.util._array_slice_ifempty usage which was removed in Iris 3.0.2 (270)
* Drop Python 3.6 support, add bootstrap lockfiles infrastructure (272)

See "What's new in iris-grib v0.17.1" [iris-grib 0.17.1 release notes](https://iris-grib.readthedocs.io/en/v0.17.1/ref/release_notes.html)

Changes summary:
* Add Cirrus-CI testing (250, 262)
* Update to badges (258, 259)
* Add support for GRIB regulation 92.1.8 when longitude increment not given (261)
* Add support for data representation template 42 (264)

See also the "What’s new in iris-grib v0.17" [iris-grib readthedocs](https://iris-grib.readthedocs.io/en/v0.17.0/)

Key changes summary :
* Latest eccodes (unpin) (208)
* Add support for Lambert Azimuthal Equal Area Projection (187)
* Make tests runnable in an installation (212)
* Add support for missing timeIncrement in template 4.8 (206)
* Correct rounding of vertical coordinates. (210)
* Changes to gdt90 load (fixes to Iris Geostationary/VerticalPerspective) (223)
* Update requirements to pick up Iris 3. (243)

For full details of what else has changed, please see the "What's new" here : iris-grib readthedocs

This is the release candidate for Iris-GRIB `0.16.0`.

To function correctly, this requires at least Iris `3.0.0`.

As Iris `3.0.0` is not yet available, please test with the [Iris 3.0.0rc0 release candidate](https://github.com/SciTools/iris/releases/tag/v3.0.0rc0).

Both the `iris` and `iris-grib` release-candidates are now available from `conda-forge`, using the special pre-release channels :

> conda install -c conda-forge/label/rc_iris_grib -c conda-forge/label/rc_iris iris-grib


For full details of what else has changed, please see the "What's new" here : [iris-grib readthedocs](https://iris-grib.readthedocs.io/en/v0.16.0rc0-docsbuild/ref/release_notes.html)