Lexcube

- Include scientific colormaps by Fabio Crameri and Proplot colormaps
- Bugfix: Don't move the center point when zooming in or out at max/min distance respectively (fixes infinitely scrolling cube)
- Bugfix: Do not force data aspect ratio in widget mode - fixes bugs with initializing widget with 100x500 (XY) data sets and similiar

- Replace typing operators to fix Python 3.9 compatibility (fixes 1, thanks haesleinhuepf)
- Fix a bug that occurs with lat-reversed data sets (going south to north) when exporting those data sets using get_current_cube_selection.

Thanks for using Lexcube! 🧊🌍

First update since the open-source release on 11th January, squashing some bugs 🐛🪲

- Convert nested CSS into valid, unnested CSS. (fixes Lexcube in VSCode Jupyter and potentially more environments)
- Correctly detect portrait/landscape orientation. (fixes Lexcube in VSCode Jupyter)
- Add a version check using version.lexcube.org which will give users a hint (at most once per hour) that a new version is available.

Thanks for using Lexcube! 🧊 🌎