old_contents: class Bridge:
  
      @staticmethod
      def noop(ca, gui):
          pass
  
      @staticmethod
      def exit_app(ca, gui):
          gui.exit_app()
  
      @staticmethod
      def speed(dspeed):
          def func(ca, gui):
              ca.apply_speed(dspeed)
          return func
  
      @staticmethod
      def toggle_pause(ca, gui):
          ca.toggle_pause()
  
      @staticmethod
      def toggle_sysinfo(ca, gui):
          gui.sysinfo.toggle()
  
new_contents: """
  This module contains the main class to be used in custom bridges.
  
  Methods from :class:`Bridge` class should be used in other bridges
  
  """
  
  
  class Bridge:
      """Main bridge class containing basic functions."""
  
      @staticmethod
      def noop(ca, gui):
          """Do nothing."""
  
      @staticmethod
      def exit_app(ca, gui):
          """Exit GUI application."""
          gui.exit_app()
  
      @staticmethod
      def speed(dspeed):
          """Change simulation speed."""
          def func(ca, gui):
              ca.apply_speed(dspeed)
          return func
  
      @staticmethod
      def toggle_pause(ca, gui):
          """Pause/unpause simulation."""
          ca.toggle_pause()
  
      @staticmethod
      def toggle_sysinfo(ca, gui):
          """Turn system info panel on/off."""
          gui.sysinfo.toggle()
  
subject: Add docstrings for bridge.base module (#23, #27)