Grid Line Detection

[OliverBenz]

Detect the grid lines on the properly warped board image. Use this to deduce the board size (9, 13, 19) and add tests to verify it could be properly detected

Example for Tests:

• grid lines are parallel for horizontal and vertical
• should habe \pi/2 angles between vert/horiz
• number of horiz lines matches number of vertical lines
• Optional: Try to detect dots on the board (if possible, might be obstructed by stones or hard to detect. If possible, could be used to verify against detected board size)

Unit test