Show routes on map

We are now displaying the players active routes on the world map. Previously the player was able to create routes, but there was no visual confirmation.

To get this happening, I first had to add line rendering to the engine. It's incorrectly scaled compared to the size of the rest of the chonky pixels onscreen, so I'd consider it more of a debugging function. But that's OK, this will work well for now. The route lines will be rendered much differently once we pretty everything up, maybe in cool arcs over the 3d globe, so no need to spend more time on it this iteration of it.