[Suggestion] Trapdoor Floor should be unlocked with regular Floor

Trapdoor Floors should be unlocked when unlocking the standard Floors - i.e., they should be a variant (like with Walls), instead of their own unlock. Trapdoors should be a separate unlock point (same as Windows and Doors). It doesn't make sense that Trapdoor Floors would be a separate unlock when Window/Door Walls are not, and IMHO it's not worth its own Tech Blueprint point.