alter cutbox to only remove structures in the direct line of sight

Alter the cut-box to only remove structures in the direct line of sight with the player to the focal point, be it a mini or set point. A good example of this would be in the Gloomhaven PC game. The current cut-box is an easy way to view things when building but reveals too much in game.

This would give us another possible way to view complex boards in a gaming session.