Extract byte-identical duplicated code into shared helpers (behaviour-neutral):
- New InputUtil.cs: single source for mouse-delta/scroll/cursor-lock, modifier
and mouse-button reads, previously copied verbatim across camera controllers,
MeshPainter, FirstPersonMode and PlayerCharacterController.
- GetMatFloat/SetMatFloat replace the 12x material-instance + HasProperty guard
pattern for the camo/height float properties.
- Route two inline button hooks through the existing Hook() helper.
Bespoke variants deliberately kept local (FreeCam SprintHeld = LeftShift only,
MeshPainter.TryGetMouse with out-params).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
