Can't move next to wall with elixir active

[max-devisser]

For example, if you currently have a speed of 3, and there is one space between you and the wall, you can't get to that space between since moving in that direction will cause the game to think you are trying to move out of bounds and force you to stay in the same position. Instead, it should move you one space forward. Point estimate 100 pts.

[MadRubicant]

F16 OK (100 pts)

[xavierholt]

Would be fixed by #63.