1.16 - Fix bad FoW check in PointerTool

[kwvanderlinde]

Identify the Bug or Feature request

Fixes #5308

Description of the Change

This fixes two issues with PointerTool:

1. During validation, token bounds must offset based on the lead token anchor position instead of it's regular x/y coordinates. The rest of the drag logic works off anchor position since 1.16, so this needed an update as well.
2. Separates the validation logic from the "Snap Token while dragging" preference so it isn't required to get consistent validation for snap-to-grid tokens.

StampTool was updated in a similar way to stay as much in line with PointerTool as possible, even though it doesn't have the same underlying issue due to not validating stamp moves.

Possible Drawbacks

None

Documentation Notes

N/A

Release Notes

• Fixed a bug where hard FoW would erroneously block token moves in some cases and fail to moves in other cases.

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