Command line tool which builds and runs Rstb tests using Icarus Verilog.
Other simulators will be added in the future.
rstbrun requires tests to have a rstb.toml
file in their project directory, which contains locations of HDL sources and the top-level name:
```toml
[test]
toplevel = "toplevelname"
[src] verilog = [ "hdl/dut.v", "hdl/wrapper.v", ] ```