Handle options of main.c in a similar way as options of civetweb.c
Handle options of main.c in a similar way as options of civetweb.c

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver