Render nature-reserve and theme park overlays below text and icon layers

This resolves #1046.

This resolves #1050
Merge branch 'landuse-overlay-order' of https://github.com/math1985/openstreetmap-carto into math1985-landuse-overlay-order

Conflicts:
	project.mml
	project.yaml
Merge branch 'math1985-landuse-overlay-order'