Wrfplot

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* Included '--ulevels' command line argument/ option to allow user to specify their own list of levels. It should be between 50-1000hPa levels only.
* Removed `_version.py` file from the source. This would be created automatically during build process.
* Update to Documentation to reflect two added options.

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* Included '--cmap' command line argument/ option to allow user to specify their own colormap (list supported by wrfplot )
* Shifted to 'setuptools-git-versioning' module to automate release
* Corrected bug that prevented GitHub build process
* Reduced shapely version to 1.8.5 make it compatible with binary and module versions
* Improvements to build_exe.py script to make the release process smother

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* Updated pyproject.toml to make use of "build" module (finding it much simpler to use)
* Fix for rub time versioning
* Removed setup.cfg file from source
* Removed versioneer as dependency

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Not released. Due to various internal bugs.

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* Shifted compilation backend to pyinstaller for automatic release process
* Fix for colormaps module to work with latest version of matplotlib
* Included versioneer for managing app version
* Fix for crash while including frameon parameter with latest version of matplotlib
* Refer the Documentation at https://wrfplot.readthedocs.io/

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* Cartopy no more would download shapefile from internet
* Fixed bug that caused plotting of upper atmospheric data to fail
* Added test script for automated testing
* No more crashes when plotting multiple variables (both surface and upper atmosphere data)
* Refer the Documentation at https://wrfplot.readthedocs.io/