Yet Another %@!$ing ZZT Update (New STK-Extending Toolkit)

My apologies for ringing the bell, for all the people who couldn't care less. Just wanted to release, in ZZT toolkit form, the results of some new ZZT research of mine, which has allowed for coaxing white-on-grey text/ANSI tiles, and blinking equivalents of those and white-on-black ANSI tiles out of the engine. This is the first extension of STK in 20 years, as far as I can remember. For anyone…