* Cosmetic code changes.

the DOS/conio.h driver, and updated the unicode test accordingly.

equivalents in CP437 0x7f - 0xff are translated.

they can force a resize. We need to find a way to make those specific
    cucul - caca interactions unavailable to the clueless user.

by simply ignoring everything non ASCII :-)

and simplified the handle_resize() API. Still can be polished.

files. Phew. Now they just need a few comments.

* Added a build-dos script to cross-compile the DOS version using djgpp.

properly credited authors and documented a few things.

broken, and event handling is not yet in the driver-specific files, but
    I will of course fix that later.