Feature Request: Hide Specified Ports

[sifferman]

Hello. Thanks for all the work done for this tool!

It could be convenient to hide certain signals from a netlist, such as clock and reset.

Maybe there could be an option such as --hide-port <port>? And it just removes that wire until the first cell that uses it.

As a visual example, here are two netlists of a register file. One was exported by netlistsvg, the other had the clk signal manually removed with Inkscape. (I find the one without the clk signal much cleaner).