Dted

Update minimum python version to 3.9 and refresh project.

- Remove now unnecessary <3.9 dependencies.
- Clean up typehinting for numpy arrays and their contents.
- Fix a numpy deprecation warning.

Improvement: VoidDataWarning can now be disabled with a keyword argument:

- dted.Tile(..., warn=False)
- dted.Tile.load_data(..., warn=False)

Bug Fix: Prevent unspecified, non-relevant metadata from causing errors
when parsing DTED files.
These fields will no longer cause errors:

- AccuracyDescription.absolute_horizontal
- AccuracyDescription.absolute_vertical
- AccuracyDescription.relative_horizontal
- AccuracyDescription.relative_vertical
- DataSetIdentification.edition
- DataSetIdentification.orientation
- DataSetIdentification.coverage
- UserHeaderLabel.vertical_accuracy

The following fields are now explicitly required:

- DataSetIdentification.latitude_interval
- DataSetIdentification.longitude_interval
- DataSetIdentification.shape
- UserHeaderLabel.latitude_interval
- UserHeaderLabel.longitude_interval
- UserHeaderLabel.shape

Bug Fix: incorrectly computing LatLon -> Tile Index conversion.
Caused `Tile.get_elevation` to give incorrect results for DTED
level 0 and 1 tiles.

Bug Fix: incorrectly parsed lat, long resolutions

Bug Fix: incorrectly parsed dataset shape

First Release!

Features

- Parsing SRTM DTED files
- CLI (including terminal plotting)