Debugger: hotSwap faster.
Debugger: clean up filterReachableNodes.
Debugger: signal graph renderer works again.
Debugger: make size of div 0, so it doesn't scroll more than it needs to.
Debugger: fix sizing of nodes.
Debugger: 1.5x label space.
Debugger: remove unused inputDiv.
Debugger: rename.
Debugger: don't use setInterval to update signal graph.
Debugger: clean up.