Adding POD to stringout record and menuYesNo, menuOmsl, menuIvoa menus

Created by: SaeedHaghtalab

• The menuIvoa.dbd is included in stringout.dbd.pod but I didn't remove the #include "menuIvoa.h" from stringout.h to test the redefinition guard.
• In original pod file from wiki, There are some device support routines described that are not defined in devSoSoft.c. I just left the write_stringout routine there which is the only routine defined for stringout record. I'm not sure if I should keep them or not.