Get title of Image on URL and display on sidebar

[Chinazaekpere-Ike]

I have fetched the name of the image from the inputted URL. This is the same name which the user originally saved their image on archive.org

This gotten image name s now displayed on the sidebar (beneath the gotten image) as the Image title

Fixes publiclab#1202

• Get title of Image on URL and display on sidebar publiclab/Leaflet.DistortableImage#1202

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Thanks!

@jywarren Hope this looks good.