Feature Request: Allow choice of variables visible in waveform/debug tree

[HazeSystem]

In my own project there are variables I would like to see in the waveform/debug tree but inexplicably do not show up. For example, r and b show up but not g. At one point only one of three counters showed up, but somehow at some point the sole counter stopped showing up at all. Neither clk nor reset show up, in the waveform, but they do in the debug tree. Possibly have a check mark next to the variable name in the debug tree to have it visible in the waveform?

[sehugg]

Verilator is kind of harsh with its optimization, sometimes it factors out entire signals and they don't show up as a named variable. Maybe there's a way to turn optimizations off for debugging.