Implement issue 2290 (render leisure=resort)

[GunSmoker]

Fixes #2290

Almost always people use tourism=camp_site instead of (or in addition to) leisure=resort, because leisure=resort is not rendered, while tourism=camp_site is. Both tourism=camp_site and leisure=resort seems to be very similar, so it would make sense to render (or not render) both.

Changes proposed in this pull request:
Render leisure=resort like a tourism=camp_site, but with the \symbols\leisure\resort.svg icon instead of the tent.

[imagico]

This lacks a rendering example.

The symbol used seems to be the same as the one for tourism=wilderness_hut - meaning that symbol wise tourism=wilderness_hut and leisure=resort would render the same - which is not a viable approach.

Apart from that my comments in #2290 (comment) still apply. I am not sure what semantic paradigm the rendering of leisure=resort here is meant to communicate and if that is clear it would remain to be seen if mapping widely follows that paradigm.

[pnorman]

Please provide a sample rendering so we can review it. Also, can you please squish the commits together and force-push to this branch?