Add support for Google Earth URLs

Google Earth appears to store sufficient lat/long information in its URL to allow mapswap to work, but it's in a different format that is not currently supported.

Here is an example Google Earth link that confuses MapSwap:

https://earth.google.com/web/@-5.79233065,110.46929098,8.72836528a,10799.14665737d,35y,0h,0t,0r/data=OgMKATA