Reworks Restriction Whitelist / Blacklist, resolves #2833

Takes a stricter aproach for whitelisting / blacklisting restrictions:

- uses `restriction=`
- uses more specific `restriction:<type>=`
- uses `except=<type>` to invert

Where `type` is the type of transportation to restrict, e.g. `motorcar`.

https://github.com/Project-OSRM/osrm-backend/issues/2833

profiles/foot.lua

@@ -10,7 +10,7 @@ access_tag_restricted = { ["destination"] = true, ["delivery"] = true }
 access_tags_hierarchy = { "foot", "access" }
 service_tag_restricted = { ["parking_aisle"] = true }
 ignore_in_grid = { ["ferry"] = true }
-restriction_exception_tags = { "foot" }
+restrictions = { "foot" }
 
 walking_speed = 5
 
@@ -71,8 +71,8 @@ properties.continue_straight_at_waypoint = false
 
 local fallback_names     = true
 
-function get_exceptions(vector)
-  for i,v in ipairs(restriction_exception_tags) do
+function get_restrictions(vector)
+  for i,v in ipairs(restrictions) do
     vector:Add(v)
   end
 end