When hovering over NN object, highlight lines

[TNTOutburst]

Right now the neural net is crowded and it's hard to see some of the line connections. This will only become worse when more advanced neural nets are created. It would be nice if when you hover your mouse over a neuron its lines go over the other neurons (it's kinda hard to see where they connect right now since they are so close together) and maybe give an outline to the lines.