Typedefs starting with `s' in src/includes

• SCSICHIP src/includes/configuration.h:278
• SCSI_DEVTYPE src/includes/configuration.h:168
• SCSIDISK src/includes/configuration.h:175
• SGOBJ src/includes/sdlgui.h:63
• SHORTCUTKEYIDX src/includes/configuration.h:95