This fixes the Linux crash on exit in SDL when X11 mode is used (and possible
others).

scaling but forces it to 2.  This is to allow two "pixels" for each "real pixel".

If we don't have two pixels, the chrominance values cannot be represented
correctly, only the luminance... resulting in a monochrome image.

xlat table since it is obviously not ASCII.

Solves the light cyan text on white background menus issue in that mode.

Deal with that fact.

reversed via gettext() for non-ASCII fonts such as Commodore and Atari.

This functionality is enabled via the ciolib_xlat variable.  Setting it to
zero (the default) means no translation is done.  Non-zero translates from
ASCII to the current font.

This functionality is only available to built-in fonts.  No attempt to
allow user-defined or BBS-defined fonts to access this functionality is
planned.  If you want to use custom fonts, use ASCII.

Thanks Digital Man!

Fix *nix builds.

vssprintf() is now only needed for older VS versions.

character first (checks the return value instead of the function pointer).

Thanks!

I've likely broken something though, so if you see weird behaviour with
extended ASCII, let me know please.

Apparently pragmas need \r\n at the end.

132 to support all modes and do proper wrapping.
For cterm, remove extra tab handling code, start tab sequence with 1,9
and other general tab fixes.

This seems to bring it into line with UNIX consoles and HyperTerminal.

                 Enable         Disable
Alt Charset     CSI[?31h       CSI[?31l
Disable Bright  CSI[?32h       CSI[?32l
Bright BG       CSI[?33h       CSI[?33l

1) The ability to make attribute bit three select a second character set
2) The ability to make the blink attribute toggle background intensity
3) The ability to make attribute bit three NOT select high intensity
4) More control over the cursor than just three constants

CTerm support to follow using private set mode parameters.

use the constants.

Add support for the abort key.

More alloc reductions for cterm
Overhaul of ATASCII mode.  Works better with break animations now, but there
are still a couple glitches.

I think I need someone with real hardware and real terminal software to
answer a few questions (especially about edge effects)

(Which is used by the scroll functions)

Use movetext() rather than alloc()/gettext()/puttext() in cterm.c

Do not define argptr2 in cprintf() unless it will be used.

This is untested since my system has a terrible video card.