Fit shapes on a board

[Itangalo]

A functionality that would be useful to have is to test if a given shape fits on a board.

Kind of:

• A shape is defined by a number of coordinates for cells making up the shape.
• A shape fits if its cell coordinates match coordinates for "free" spaces on the board (within some epsilon tolerance).
• Start space on the board is given.
• Start cell on the shape is given?
• Rotation of the shape is either given or all rotations are tested.