Request: Get current waypoints

[drucifer]

Feature Request

It would be helpful to be able to get a list of currently set waypoints.

I would imagine this being implemented as a GET method on the existing /ui/autopilot/waypoint/ POST endpoint.

Use case

1. In some cases it would not be necessary (and would cause an error) to set a new waypoint if the waypoint is already set. It would be helpful for apps to be able to detect this condition in advance of attempting to set a new waypoint.
2. Would allow features that could compare certain region dependent information between the current location and destination, e.g. market orders on watched items for a hauling focused app.
3. Would allow "reminder" features, e.g. if your current ship is heavy on explosive mitigation and you are leaving Minmatar / Angel space and headed towards Gallente / Serpentis, a PVE focused app could recommend swapping to thermal mitigation.

Authentication

Authentication is required as this data is specific to the current user's UI.

There is an existing esi-ui.write_waypoint.v1. Following the convention used by other endpoints, this would need a new scope such as:
esi-ui.read_waypoint.v1

Example return

[
    30002771,
    30002770,
    30002769,
    30002772
 ]

Checklist

Check all boxes that apply to this issue:

• Feature request description is provided
• Use case exists
• Feature requires a new route
• Feature adds data to existing route
• Feature requires new auth scope
• Feature can reuse existing scope
• Feature does not require auth
• Meta feature, applies to all routes

[CarbonAlabel]

Duplicate of #366.