Verilator

Even though it's bad practice there are lot's of designs which depend on the order in which files are read (command line and -f inpfiles) due to the fact that they don't cleanly `include files with `defines.

Verilator is using a set for the verilog files to be read, it would be nice to change that to an ordered list.

V3Options.h:typedef set<string> V3StringSet;
V3Options.h:    V3StringSet     m_vFiles;       // argument: Verilog files to read