Console improvements

[macarooni-man]

• [ ] Add an event filter to the ConsolePanel with checkboxes to only show specific events
• [x] Make "preparing spawn area" in console persist on one line, and update the percentage
• [x] When the server is closed, display a "show log"/"hide log" button in the top right corner to view the last log if it exists
  • [x] Ignore "enter" keypress to start server when displayed
• [x] If the server is not responding (stop was pressed, or no CPU usage/memory changes for ~15s), change the stop server icon to kill server icon to terminate java process
• [ ] Escape markup for text labels in the console before they are processed, and before markup is added to prevent a TypeError