Create pragmas that can set command line options

[JulianKemmerer]

Opposite to #79 where it is requested that command line arguments be able to set pragmas ...do the reverse as well. Allow pragmas in code to specify things from command line args as well...

Ex. something like
#pragma SIM VERILATOR MAIN_CPP /path/to/your/main.cpp
As opposed to command line options --sim --verilator --main_cpp /path/to/your/main.cpp