[Feature request] Bearing line for helms and single pilot

Problem,

When moving using the arrow key, the only indication of bearing is on the top left or bottom right. When in a dogfight, the player must either change to use the mouse (and potentially not be able to do combat maneuvers if they use the mouse for them), or look outside of the radar screen to get the precise bearing.

This makes precision maneuvers difficult during a fight.

Solution,

Adding a line parallel to the ship direction to the specific bearing allows for the player to have an approximate idea of where they are heading while keeping their attention on the relevant information.

Example as follows:

Start by locating the radar display and the helm or single-pilot arrow-key handling described in the issue. Trace how the current ship bearing is represented in that display; done means a line parallel to the ship direction indicates the selected bearing during precision maneuvers.