Create grid layout for bricks

[wkeeling]

Possibly create a function in rounds.base.py

grid_position(x, y, brick)

The function assumes a grid x bricks wide and y bricks tall. Calling the function will blit the brick to the screen at the given grid coord and update the brick's rect.

Such a function can act as a convenience when having to position bricks at specific locations.

[wkeeling]

This has been implemented: BaseRound._blit_brick(brick, x, y). The x and y are relative coordinates starting at 0,0 at the top left corner of the game area.