Consider better implementation for ColorBoostBeatmapEventData

[rigdern]

I went with the easiest implementation. My understanding is that ColorBoostBeatmapEventData enables the map to switch between two different color schemes. I'm not sure exactly what colors are affected. Maybe just lights & lasers? This video has some info: Boost Colors | Beat Saber Explained - YouTube

Currently, for each map segment, there's no guarantee that we preserve that segment's original boost setting. We should consider preserving it. The problem is that the boost color setting is stateful so a segment receives the boost color setting of the most recent ColorBoostBeatmapEventData event.