SS: Run VDP1 vblank erase at end of vblank, so we know how much time we have and thus how many entries in the framebuffer we'll be able SS: Replaced some instances of case ranges with more portable constructs. 'MDFN_SS_DEV_BUILD' defined(such as with -DMDFN_SS_DEV_BUILD=1 in CPPFLAGS env var passed to configure).
SS: Settings 'ss.dbg_mask' and 'ss.dbg_exe_cdpath', and the functionality they control, are no longer available unless Mednafen has been compiled with
