Add Pen Pan/Scroll 1.0.0

[djoliverm]

Summary

Adds Pen Pan/Scroll 1.0.0 for OpenTabletDriver 0.6.7 on macOS.

• Hold a configured pen button, touch the nib, and drag to scroll on both axes.
• Keeps the pointer anchored while scrolling and suppresses tip/button clicks during the gesture.
• Supports natural direction, per-axis sensitivity, reversal, lift-and-reposition strokes, and fractional accumulation.
• Fails open on unsupported platforms and passes input through unchanged.
• MIT licensed; source, tests, and documentation are public.

Verification

• Source: https://github.com/djoliverm/otd-penpanscroll
• Release: https://github.com/djoliverm/otd-penpanscroll/releases/tag/v1.0.0
• CI: macOS, Windows, and Ubuntu build/test jobs pass (16/16 scenarios on each runner).
• Release ZIP contains the DLL and local metadata at archive root.
• Live release SHA-256 matches the submitted metadata: 53d79dde89040a74d3325790a83220e0f6e05fd90c9ac68c401a91c0e2d7dad4.

Related submission

This is distinct from #175: Pen Pan/Scroll keeps the pointer fixed and maps physical pen travel to pixel-based, natural two-axis scrolling. It does not provide cursor-following Drag/Joystick modes.

[Kuuuube]

This appears to already be covered by the "pen scroll" binding option in https://github.com/Mrcubix/Scroll-Bindings/.