The Arena has grown!

A few minor updates to 5e Arena:

• Changed the size of the combat zone from 40 x 40 feet (8 x 8 squares) to 50 x 50 feet (10  x 10 squares).
• Changed the shape and position of some of the in-map obstacles to take advantage of the larger size.
• Changed the movement directional words to arrows.
• Fixed minor spelling errors and broken image links.