Lfview-resources-spatial

Minor Changes
OptionsTexture now has the additional boolean attribute `visible`.

Minor Changes
`OptionsPoints` support two additional attributes
* `size` of type `OptionsSize`
* `shape` of type string with options `'square'` or `'sphere'`

Minor changes
- Element options updated for compatibility with data on lfview.com
- `OptionsSize` has a default value of `10`, currently only used for `OptionsTubes.radius`
- `OptionsBlockModel` allows optional attribute `textures` which must be an empty list

Initial Release
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`lfview-resources-spatial` includes Element, Data, Mapping, and Texture classes to be used by the [LF View](https://lfview.com) API [Python client](https://github.com/seequent/lfview-api-client). Documentation for these resources is available on [readthedocs](https://lfview-resources-spatial.readthedocs.io/en/latest/).

**Note**: The LF View API and all associated Python client libraries are in pre-release. They are subject to change at any time, and backwards compatibility is not guaranteed.