Add icon for shop=massage

[jragusa]

Fixes #3287

Changes proposed in this pull request:
Render shop=massage from z18 using leisure-green colour

Test rendering with links to the example places:

Node
https://www.openstreetmap.org/node/4992712423

Way
https://www.openstreetmap.org/way/183708628

[kocio-pl]

After merging #3293 this code needs to be updated to resolve conflicts.

[jragusa]

Done :)

[kocio-pl]

Hm, it works strange - for z17 instead of dot (which color should it be?) it shows miniaturized icon, for example:

[jragusa]

I see why there is an small icon at z17. But before to make changes, I would like to know whether we leave a dot for z17 like other shops or we bypass rendering for z17 ?

[lakedistrictOSM]

I think that we should bypass rendering at z17. z18 is good enough for massage places.

Purple would be the wrong colour and green dots aren't yet used (and also might look like trees).

[jragusa]

After correction:

z17
name appears as there is no pink dot (I suppose)

A suggestion would be to shift rendering at z17 such as fitness_center

z18

z19

[kocio-pl]

I guess it's safe to render from z18. I don't have good idea for not typical colors of shops - BTW similar problem is with shop=car_repair (#1778).

[kocio-pl]

Could you update the code once again? I plan to merge it soon.

BTW: please, add some line breaks aligned to the lines above, so the code is more readable and easier to edit.

[jragusa]

Done, I also put some line breaks as suggested.

Is it correct for you ?

[kocio-pl]

Thanks, this is good!