pretest refinement

• improvements to bot behavior, prevent getting "stuck" shooting for an unattainable goal
• enable WASD and IJKL keys for up,left,down,right for single hand play
• remove occupancy check since bot was server side and participant state is client-side, bot information lags behind. Eventually we should move all logic to the client side and consider getting rid of the server + facilitator entirely for the single player + bot games