Change sports_centre and stadium color to green

[kocio-pl]

Now that we use light green for different small leisure areas, we could use it also for big ones, as they typically don't overlap.

That unification would also offload societal_amenities color a bit (so we have less problem defining what it really is) and tie green color closer with the physical activities, which makes the system more predictable.

Examples in Warsaw (with different landuses around):

Before

After

Before

After

Before

After

Before

After

[kocio-pl]

Additional question: should we use italic font for such names? Is it kind of standard for areas (you can see it with school, park, residential and allotments)?

[lakedistrictOSM]

This looks good, it makes it different from schools and hospitals now. Italics are probably a good idea until we introduce a symbol.

Will this PR change the way leisure=sports_centre + building=yes is rendered?

[kocio-pl]

No, it changes a color only in the places where yellowish is visible now.

[polarbearing]

You mean it would bring us closer to render societal amenities campuses, ref #1624 ?

I did not like the yellow for sports so much (which happened only recently #2071), thus the green is better. It still does not distinguish a stadium within a surrounding sports_centre #919.

[matthijsmelissen]

Looks good!