GDM 8: Never ship a first-person view without correctly supporting inverted Y-axis.

Invert-Y users are uncommon enough that you may not have one on your dev team, but there will be plenty in your user base. Supporting them is trivially easy, so don’t half-ass it - for exmample, but adding a setting but then ignoring it when the player is in a vehicle.

If your game has several modes and it’s not clear which ones should get inverted, just have per-mode settings.

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