v0.4.0: Command History, Scrolling, Keyboard Shortcuts

• Command history can be accessed using the up and down keys.
• Scrolling through the console history can be done with the page up, page down, alt up and alt down.
• Keyboard shortcuts for editing line (ctrl u to clear, ctrl a to do to the beginning of a line, ctrl e to go to the end).
• Improved memory usage.
• Early connect to Screeps server to detect errors sooner.