Add support for SystemVerilog

[Sean McLoughlin]

Language
SystemVerilog is the industry standard Hardware Description Language (HDL) used in the semiconductor industry for defining hardware designs and writing object-oriented code, constraint solvers, and assertions to verify those designs.

Prism currently only supports Verilog which is a much smaller subset of SystemVerilog.

Additional resources
SystemVerilog Wikipedia
SystemVerilog Language Reference Manual