[racket] racket 5.4 syntax tweak wishlist

> * Colon keywords -- Make symbols beginning with the colon character read as
> keywords.  Possibly also make keywords print as starting with colon rather
> than pound-colon.  I know some people don't mind "#:", but I don't like
> typing it or looking at it.  I think "#:" also looks gratuitously
> different/cumbersome to people coming from Lisps, and unnecessarily cryptic
> to people just coming from anywhere else.

I don't mind it myself.

I could see it being unfortunate if one had Beavis and Butthead
froshlings tittering in the back row.