Display eclipse map directly within the program

[Atque]

As per #3719, we can export a raster image of the shadow path of the Moon during a solar eclipse. It would be nice if this could be shown directly within the program, possibly as a tab in the "Eclipses" section of the AstroCalc.

[10110111]

I initially thought this could go into the Location dialog, so that one could use the eclipse chart as a guide for choosing where to go.

But OTOH, in this case the user may want to also automatically adjust time, so that by default switching to the new location would go to maximal eclipse at that geographical point. So maybe indeed it should be somewhere in the AstroCalc dialog — or in a dialog that could be opened by some button in AstroCalc, like "Show on a map".

[gzotti]

Given screen space restrictions, a separate panel may be best. The Location dialog is already very complicated. This new panel may also show the optimal location, or set location/(optionally!) best time on clicking the map. Some functionality will still have to be taken from LocationDialog. Subclass?

[github-actions]

Hello @Atque!

Thank you for suggesting this feature.