Add requires.tables to <layer>.yaml (#1236)

**NOTE** this can only be merged after the next tools version is released.

Added required Postgres tables to the `<layer>.yaml` definition.
Close: #1220

PR of tools: https://github.com/openmaptiles/openmaptiles-tools/pull/370

layers/boundary/boundary.yaml

@@ -1,5 +1,13 @@
 layer:
   id: "boundary"
+  requires:
+    tables:
+      - osm_border_linestring
+      - ne_10m_admin_0_countries
+      - ne_10m_admin_0_boundary_lines_land
+      - ne_10m_admin_1_states_provinces_lines
+      - ne_50m_admin_0_boundary_lines_land
+      - ne_110m_admin_0_boundary_lines_land
   description: |
       Contains administrative boundaries as linestrings.
       Until z4 [Natural Earth data](http://www.naturalearthdata.com/downloads/) is used after which

layers/landcover/landcover.yaml

@@ -1,5 +1,8 @@
 layer:
   id: "landcover"
+  requires:
+    tables:
+      - ne_50m_antarctic_ice_shelves_polys
   description: |
       Landcover is used to describe the physical material at the surface of the earth. At lower zoom levels this is
       from Natural Earth data for glaciers and ice shelves and at higher zoom levels the landcover is [implied by OSM tags](http://wiki.openstreetmap.org/wiki/Landcover). The most common use case for this layer

layers/landuse/landuse.yaml

@@ -1,5 +1,8 @@
 layer:
   id: "landuse"
+  requires:
+    tables:
+      - ne_50m_urban_areas
   description: |
       Landuse is used to describe use of land by humans. At lower zoom levels this is
       from Natural Earth data for residential (urban) areas and at higher zoom levels mostly OSM `landuse` tags.

layers/place/place.yaml

@@ -1,5 +1,10 @@
 layer:
   id: "place"
+  requires:
+    tables:
+      - ne_10m_admin_1_states_provinces
+      - ne_10m_admin_0_countries
+      - ne_10m_admin_1_states_provinces
   description: |
       The place layer consists out of [countries](http://wiki.openstreetmap.org/wiki/Tag:place%3Dcountry),
       [states](http://wiki.openstreetmap.org/wiki/Tag:place%3Dstate) and [cities](http://wiki.openstreetmap.org/wiki/Key:place).

layers/transportation/transportation.yaml

@@ -1,5 +1,8 @@
 layer:
   id: "transportation"
+  requires:
+    tables:
+      - ne_10m_admin_0_countries
   description: |
       **transportation** contains roads, railways, aerial ways, and shipping
        lines.

layers/transportation_name/transportation_name.yaml

@@ -1,7 +1,9 @@
 layer:
   id: "transportation_name"
   # transportation_name relies on the function highway_class() defined in transportation layer
-  requires: "transportation"
+  requires:
+    layers:
+      - transportation
   description: |
       This is the layer for labelling the highways. Only highways that are named `name=*` and are long enough
       to place text upon appear. The OSM roads are stitched together if they contain the same name

layers/water/water.yaml

@@ -1,5 +1,8 @@
 layer:
   id: "water"
+  requires:
+    tables:
+      - osm_ocean_polygon
   description: |
       Water polygons representing oceans and lakes. Covered watered areas are excluded (`covered=yes`).
       On low zoom levels all water originates from Natural Earth. To get a more correct display of the south pole you should also

layers/water_name/water_name.yaml

@@ -1,5 +1,9 @@
 layer:
   id: "water_name"
+  requires:
+    tables:
+      - ne_10m_geography_marine_polys
+      - lake_centerline
   description: |
       Lake center lines for labelling lake bodies.
       This is based of the [osm-lakelines](https://github.com/lukasmartinelli/osm-lakelines) project

layers/waterway/waterway.yaml

@@ -1,7 +1,9 @@
 layer:
   id: "waterway"
   # waterway relies on the function waterway_brunnel() defined in water layer
-  requires: "water"
+  requires:
+    layers:
+      - water
   description: |
       OpenStreetMap [waterways](https://wiki.openstreetmap.org/wiki/Waterways) for higher zoom levels (z9 and more)
       and Natural Earth rivers and lake centerlines for low zoom levels (z3 - z8).