Major rework of the $sscanf()/$fscanf() code.
Major rework of the $sscanf()/$fscanf() code.

Add support for %m, suppression '*' and a maximum field width along with
a number of other fixes/enhancements. There is still no support for
%u, %v or %z.

themperek/iverilog,CastMi/iverilog,CastMi/iverilog,themperek/iverilog,CastMi/iverilog,themperek/iverilog