[Accessibility-testing] Inform test game

[Andrew Plotkin]

I have a mostly-complete draft of the Inform test game:

https://eblong.com/zarf/tmp/accessib/

I still need to fill in a couple of corners, and also add an ending. But 
all of the specified interactions are in place. Most of them earn you 
a "treasure", although one just increases your score. I may do more with 
the score idea.

I dropped one of the specified interaction, the one about "the word ALERT 
flashes in the status line one turn later". I decided that wasn't 
something that any IF game would expect you to notice, sighted or not. 
Instead, I added a use of the standard Inform block quotation facility.

--Z

-- 
"And Aholibamah bare Jeush, and Jaalam, and Korah: these were the borogoves..."
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