Changed _size to size and _position to position to a) indicate that they are "public" members, and b) to make move() work properly
Made sure that position (in Paddle __init__) is a list so that it's mutable
Make sure size is a list
Revert "Make sure size is a list"

This reverts commit 1fb82601e6bd254752d8dd48e0035c611b5b2628.
Converted size to list in get_rect
Added ball and renamed previous draw function to better describe its possible uses