Added Features.

Added features:

- Zoom level increased when equipping the Railgun.   

- Ctrl and Space Bar keys are no longer used for firing, to address the Ctrl + W problem in Chrome.

- Added new room with Drone enemy that chases and shoots the player. Note: Enemy is bound to that room and won't chase if the player leaves it.

Thanks to FedCap (https://itch.io/profile/fedcap) for the feedback!