Solarmach

What's Changed
- move code to the [solarmach](https://github.com/jgieseler/solarmach) package, here only the Streamlit code remains
- update functionality to [solarmach 0.1.5](https://github.com/jgieseler/solarmach/releases/tag/v0.1.5):
- Added option to change between Carrington and Stonyhurst coordinates for the whole tool (deprecates overplotting of Earth-centered coordinate system)
- Added option to change Earth position in the plot
- Take into account solar differential rotation wrt. latitude (see [21](https://github.com/jgieseler/solarmach/issues/21))
- Instead of spherical radius, plot its projection to the heliographic equatorial plane (see [3](https://github.com/jgieseler/solarmach/issues/3))


**Full Changelog**: https://github.com/jgieseler/Solar-MACH/compare/v0.1.2...v0.1.5

<!-- Release notes generated using configuration in .github/release.yml at v0.1.4 -->

What's Changed
Bugfixes 🛠
* fix messing up Pandas and matplotlib settings by jgieseler in https://github.com/jgieseler/solarmach/issues/18
New Features 🎉
* make compatible with streamlit by jgieseler in https://github.com/jgieseler/solarmach/pull/19

**Full Changelog**: https://github.com/jgieseler/solarmach/compare/v0.1.3...v0.1.4

- Add `coord_sys` option to the initialization of `SolarMACH` that can be either `'Carrington'`or `'Stonyhurst'`. This sets the used coordinate system for the whole tool. Closes https://github.com/jgieseler/solarmach/issues/1. Replaces the `show_earth_centered_coord` boolean option in `SolarMACH.plot()`
- Add `long_offset` parameter to `SolarMACH.plot()` that defines the longitudinal offset for the polar plot; defines where Earth's longitude is (by default 270, i.e., at "6 o'clock")
- Add `return_plot_object` option to `SolarMACH.plot()`. If set to `True`, the matplotlib figure and axis object are returned, allowing further adjustments to the figure. Closes https://github.com/jgieseler/solarmach/issues/2

Release version in sync with [solarmach](https://github.com/jgieseler/solarmach) 0.1.2