Verilog support

[wmin0]

Add Verilog support based on https://www.verilog.com/VerilogBNF.html#REF170

[googlebot]

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[googlebot]

CLAs look good, thanks!

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[wmin0]

@googlebot I signed it!

[wmin0]

Hi @mikesamuel ,

Sorry for pinging you, because I just find who recently commit this project and ...
I'm wondering is this project still alive.

Thanks