[racket] Preliminary support for Racket on EV3

Couple more questions: Is the use of defines inside let different from
using let*? And does #%datum actually need to be exported? Based on
documentation and trying it seems like it doesn't actually touch the
new "literals" since they are treated as symbols.

-- 
Tomi Pieviläinen, +358 400 487 504
A: Because it disrupts the natural way of thinking.
Q: Why is top posting frowned upon?
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