Blender Git Loki

Add signal for end of tablet input to x11 and cocoa.

Defer mouse centering until mouse have moved.

Fix T83930 and Fix T84659: Walk navigation tablet bugs.

Fixes T83930, allowing walk navigation to continue without jumping back
after repositioning pen.

Fixes T84659, allow walk navigation to start (for Windows Ink) from
keyboard shortcut when pen is in use.

Maniphest Tasks: T84659, T83930

Differential Revision: https://developer.blender.org/D11651

Cleanup: Swap defines for static const in walk and fly mode.

Supply tablet data in mouse fallback for Wintab cursor movement.