Add rendering of aerialway=zip_line

[jragusa]

Expected behavior

Basically, aerialway=zip_line should be rendered like most of aerialways (e.g. aerialway=chair_lift) Using a distinct pattern would be excluded due to the low usage (only 426 on Taginfo with regard to the 8053 counts for aerialway=chair_lift).

Actual behavior

aerialway=zip_line is not rendered.

Links and screenshots illustrating the problem

z=16 (https://www.openstreetmap.org/way/132119392)

Please note the two stations "Fantasticable" to the north that each correspond to a aerialway=zip_line

[jragusa]

Two additional remarks: aerialway=magic_carpet is also not displayed (1738 usages) and the rendering of aerialway=mixed_lift is missing on the wiki page.

[HolgerJeromin]

Magic carpets are mobile things (removed after snow) for winter sport only. I would not recommend rendering in this map style.

[kocio-pl]

If they are seasonal, maybe they should be rendered wit a dashed line, just like intermittent waterways?

[HolgerJeromin]

That is the problem when mixing issues.

I expect ziplines as non seasonal.

[jragusa]

Some zip_line are seasonal but most of them are available during both winter and summer.

[jragusa]

If it's ok for everyone I can make a PR for this issue. It's just 1 line to add in aerialways.mss

[kocio-pl]

OK, do it please.