Configurable snapping behaviour (#5361)

docs/http.md

@@ -32,6 +32,7 @@ To pass parameters to each location some options support an array like encoding:
 |hints           |`{hint};{hint}[;{hint} ...]`                            |Hint from previous request to derive position in street network.                                       |
 |approaches      |`{approach};{approach}[;{approach} ...]`                |Keep waypoints on curb side.                                                                           |
 |exclude         |`{class}[,{class}]`                                     |Additive list of classes to avoid, order does not matter.                                              |
+|snapping        |`default` (default), `any`                              |Default snapping avoids is_startpoint (see profile) edges, `any` will snap to any edge in the graph    |
 
 Where the elements follow the following format:
 

docs/nodejs/api.md

@@ -59,6 +59,7 @@ Returns the fastest route between two or more coordinates while visiting the way
     -   `options.approaches` **[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)?** Keep waypoints on curb side. Can be `null` (unrestricted, default) or `curb`.
     -   `options.waypoints` **[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)?** Indices to coordinates to treat as waypoints.  If not supplied, all coordinates are waypoints.  Must include first and last coordinate index.
                          `null`/`true`/`false`
+    -   `options.snapping` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Which edges can be snapped to, either `default`, or `any`.  `default` only snaps to edges marked by the profile as `is_startpoint`, `any` will allow snapping to any edge in the routing graph.
 -   `callback` **[Function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)**
 
 **Examples**
@@ -91,6 +92,7 @@ Note: `coordinates` in the general options only supports a single `{longitude},{
     -   `options.number` **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)** Number of nearest segments that should be returned.
         Must be an integer greater than or equal to `1`. (optional, default `1`)
     -   `options.approaches` **[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)?** Keep waypoints on curb side. Can be `null` (unrestricted, default) or `curb`.
+    -   `options.snapping` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Which edges can be snapped to, either `default`, or `any`.  `default` only snaps to edges marked by the profile as `is_startpoint`, `any` will allow snapping to any edge in the routing graph.
 -   `callback` **[Function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)**
 
 **Examples**
@@ -133,6 +135,7 @@ tables. Optionally returns distance table.
     -   `options.fallback_speed` **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)?** Replace `null` responses in result with as-the-crow-flies estimates based on `fallback_speed`.  Value is in metres/second.
     -   `options.fallback_coordinate` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Either `input` (default) or `snapped`.  If using a `fallback_speed`, use either the user-supplied coordinate (`input`), or the snapped coordinate (`snapped`) for calculating the as-the-crow-flies diestance between two points.
     -   `options.scale_factor` **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)?** Multiply the table duration values in the table by this number for more controlled input into a route optimization solver.
+    -   `options.snapping` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Which edges can be snapped to, either `default`, or `any`.  `default` only snaps to edges marked by the profile as `is_startpoint`, `any` will allow snapping to any edge in the routing graph.
 -   `callback` **[Function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)**
 
 **Examples**
@@ -212,6 +215,7 @@ if they can not be matched successfully.
     -   `options.gaps` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Allows the input track splitting based on huge timestamp gaps between points. Either `split` or `ignore` (optional, default `split`).
     -   `options.tidy` **[Boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)?** Allows the input track modification to obtain better matching quality for noisy tracks (optional, default `false`).
     -   `options.waypoints` **[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)?** Indices to coordinates to treat as waypoints.  If not supplied, all coordinates are waypoints.  Must include first and last coordinate index.
+    -   `options.snapping` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Which edges can be snapped to, either `default`, or `any`.  `default` only snaps to edges marked by the profile as `is_startpoint`, `any` will allow snapping to any edge in the routing graph.
 -   `callback` **[Function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)**
 
 **Examples**
@@ -276,6 +280,7 @@ Right now, the following combinations are possible:
     -   `options.source` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** Return route starts at `any` or `first` coordinate. (optional, default `any`)
     -   `options.destination` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** Return route ends at `any` or `last` coordinate. (optional, default `any`)
     -   `options.approaches` **[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)?** Keep waypoints on curb side. Can be `null` (unrestricted, default) or `curb`.
+    -   `options.snapping` **[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** Which edges can be snapped to, either `default`, or `any`.  `default` only snaps to edges marked by the profile as `is_startpoint`, `any` will allow snapping to any edge in the routing graph.
 -   `callback` **[Function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)**
 
 **Examples**