Making societal amenities look like residential on medium zoom

[kocio-pl]

Fixes #3004

Changes proposed in this pull request:

• Making societal amenities (schools, hospitals etc) look like regular built up areas on z10-z12, so we avoid light patches, which are too early to be identified and just create visual noise

Warsaw, z10

Before

After

Warsaw, z11

Before

After

Warsaw, z12

Before

After

[kocio-pl]

The difference on z12 (compare -compose src before.png after.png difference.png):

[Adamant36]

Wish we could do the same for parks. Since like 75% of them are tiny, a part of residential areas/infrastructure, and just make it more noisy at those levels.

[Adamant36]

Wish we could do the same for parks. Since like 75% of them are tiny, a part of residential areas/infrastructure, and just make it more noisy at those levels.