Add live map overlay#111
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Adds a toggleable 2D map overlay showing terrain, runways, airport areas, VOR/NDB/ILS navaids, and player position with heading indicator. Keybinds: D to toggle, E to zoom in, Shift+E to zoom out.
Screen-space vertex decimation skips polygon vertices within 4px of previous kept vertex, and skips subpixel triangles/quads entirely. Terrain is cached to a GL texture and only re-rendered every 3rd frame when position changes, using the cached texture for intermediate frames.
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Toggleable 2D map overlay showing terrain, runways, airport areas, VOR/NDB/ILS navaids, and player heading.
Keybinds: D to toggle, E to zoom in, Shift+E to zoom out.