Add oneway arrows for tracks and paths

Fixed rendering of arrows on footways: these will always use the footway color, rather than changing if there is designated=bicycle or designated=bridleway
Fix bridleway arrow color: based on brideway color instead of track color now.

project.mml

@@ -1979,6 +1979,7 @@ Layer:
     properties:
       minzoom: 13
   - id: paths-text-name
+    class: directions
     geometry: linestring
     <<: *extents
     Datasource:
@@ -1987,10 +1988,19 @@ Layer:
         (SELECT
             way,
             highway,
-            name
+            name,
+            CASE
+              WHEN oneway IN ('yes', '-1') THEN oneway
+              WHEN junction IN ('roundabout') AND (oneway IS NULL OR NOT oneway IN ('no', 'reversible')) THEN 'yes'
+              ELSE NULL
+            END AS oneway,
+            horse,
+            bicycle
           FROM planet_osm_line
           WHERE highway IN ('bridleway', 'footway', 'cycleway', 'path', 'track', 'steps')
-            AND name IS NOT NULL
+            AND (name IS NOT NULL
+              OR oneway IN ('yes', '-1')
+              OR junction IN ('roundabout'))
         ) AS paths_text_name
     properties:
       minzoom: 15

roads.mss

@@ -292,7 +292,7 @@
 @steps-oneway-arrow-color:        darken(@steps-fill, 35%);
 @cycleway-oneway-arrow-color:     darken(@cycleway-fill, 25%);
 @track-oneway-arrow-color:        darken(@track-fill, 15%);
-@bridleway-oneway-arrow-color:    darken(@track-fill, 10%);
+@bridleway-oneway-arrow-color:    darken(@bridleway-fill, 15%);
 
 // Shield’s line wrap is based on OpenStreetMap data and not on line-wrap-width,
 // but lines are typically rather short, so we use narrow line spacing.
@@ -3266,7 +3266,9 @@ tertiary is rendered from z10 and is not included in osm_planet_roads. */
         [highway = 'raceway'] {
           marker-fill: @raceway-oneway-arrow-color;
         }
-        [highway = 'footway'],
+        [highway = 'footway'] {
+          marker-fill: @footway-oneway-arrow-color;
+        }
         [highway = 'path'] {
           marker-fill: @footway-oneway-arrow-color;
           [horse = 'designated'] {