Two cameras only, one for 2d one for 3d -- none of this camera-per-state bs.
Still have a bug with switching while in the menu, but otherwise things
are working well.
The general idea is that we will have 2 cameras total, one for 2d and
one for 3d. Start with 2d and switch to 3d. Each camera will be marked
with it's state, and there will be a system which listens for some event
(or resource update) to change the camera.
* Added `moves` ledger to Board
* This should help with future work like undo, automated tests,
net-play.
* Refactored 2d and 3d displays to use BoardIndex -> Transform
* This means we can have a generic system set the position of Entities
based on moves on the Board.
* Refactored 2d view to have centered board
* (instead of shifting root entity which had poor behavior
characteristics)
Elijah Voigt