Prepare list of deprecated API parameters/values for 6.0 release

[TheMarex]

We deprecated some API parameters/values over the 5.x live-cycle and need to prepare for the 6.x cleanup.

Off the top of my head the following things are marked for removal:

• StepManeuver.bearing_before and StepManeuver.bearing_after (replaced by RouteStep.intersections)
• StepManeuver.location (replaced by RouteStep.intersections)
• StepManeuver.type = "ramp" (replaced by on ramp and off ramp)
• Using bearings= without radiuses= per Require a radius parameter other than unlimited when using bearings #2983
• Specifying a bearings range per Require a radius parameter other than unlimited when using bearings #2983

Any more things that come to mind @MoKob @daniel-j-h @danpat @freenerd?

[daniel-j-h]

libosrm API:

• Prevents typedefs.hpp from polluting the user's namespace, resolves #2940 #2941
• Fixes forwarding refs for types derived from BaseParameters, resolves #2990 #2991
• potentially moving away from the JSON variant

[MoKob]

• roundabout instruction -> enter roundabout + exit roundabout Refactor Roundabout Handler #3108 (also deprecates rotary_name)
• direction_modifier u-turn -> invalid + new turn type u-turn Make U-Turn a type (U-Turn left vs U-Turn right) #3077

[TheMarex]

@MoKob can you link the tickets for those here? I'm missing some context here.

[MoKob]

Also:

• lanes should show validity per indication Lanes should indicate validity per indication #2935

[daniel-j-h]

• Switch from always generating hint to hints on demand Lets the user specify us dropping hints in response, resolves #1789. #3456

[karenzshea]

• Remove redundant boolean based parameter for annotations in RouteParameters Remove redundant bool member for annotations param in RouteParameters #3644

[freenerd]

• Remove geojson responses and go polyline only Remove geojson, go polyline only #3752

[TheMarex]

• Remove --generate-edge-lookup parameter from osrm-{contract,customize} as it does nothing now

[daniel-j-h]

• In Implements Reasonable Alternative Routes for MLD #4047 I implemented an alternatives=n overload in addition to alternatives=true/false. With v6 the boolean overload should go. Needs adaption in route parameters, route parameters grammar and viaroute plugin callsite.

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