Finish porting Controller to KeyEventHandlers

[xsebek]

This is a follow-up Issue to #523, to port all key handlers.

• Note that not all keys have to be customizable:

    nonCustomizableHandlers =
      [ onKey V.KEnter "Show entity description" showEntityDescription
      ]

  But porting those as well will show them in the Help and notify players about conflicts.
• Some keys are handled dynamically (e.g. any other key goes to search) or must fall through if not matched (Esc).
  Those have to stay in the old handlers.
• The handlers do not have to be displayed in Help - but the players should learn about conflicts.

With those caveats out of the way, here are the missing parts:

• Main menu and new game events
  • This might need a new keybindings page in the main menu so that users can learn about those shortcuts
• Modal events - dialogs for goals, structures,...
• REPL piloting
• REPL typing
• Info panel