Radar system needs transponder support

[brooksmtownsend]

The radar system needs to detect all entities that are both in range (have a position component) and have a radar_transponder component. The radar_transponder component will contain metadata that can differentiate discovered entities on the UI (name, icon, type, etc)

[autodidaddict]

As per our conversation @brooksmtownsend :

The transponders need to convey the following information:

• The display-friendly name of the object
• The type of object that this transponder is representing

Display names for players should be the player's login name (we don't yet have logins, but we should probably rig up Auth0 at some point to get that). The following is a list of object types:

• Starbase
• Ship
• Asteroid

The JSON for the radar_transponder component then might look something like this:

{
    "object_type": "[starbase|ship|asteroid]",
    "display_name": "Asteroid"
}

we should be able to use the CoreUI Pro icons to render a starbase, a ship, or an asteroid. If not, we can find small images suitable for the radar screen display.

[autodidaddict]

In the future, if we want to have different icons for the same object type (e.g. different type of asteroid icons), we can add that later. For now, let's try and keep the scope for radar rendering as small as possible.