Remove no longer needed clipboard and ffi gems, use new CyberarmEngine::GuiState#needs_repaint? method to only paint when needed- should avoid wasting CPU/GPU time (gain a bit more battery life?), make TACNET connection error visually change UI and also trigger a TACNET dialog when not on the TACNET page

lib/pages/simulator.rb

@@ -77,6 +77,7 @@ robot.forward 100"
         @simulation.update
 
         unless @simulation.robots.all? { |robot| robot.queue.empty? } # Only update clock if simulation is running
+          current_state.request_repaint
           @simulation_status.value = "Time: #{(@simulation.simulation_time).round(1)} seconds"
         end
       end