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Gabriel439 Add `Text/show` built-in (#365)
There are two motivations for adding this built-in:

* For consistency with `Natural/show`, `Integer/show`, etc.

* To enable the implementation of a Dhall-to-JSON conversion in pure Dhall

  ... as described in:

  #336 (comment)

Carefully note that dollar signs are escaped as `\u0024` because that is the
only representation that is both JSON-compatible (since JSON does not
support the `\$` escape sequence) and Dhall-compatible (since failure to
escape `$` may accidentally generate an unintended string interpolation).
Latest commit 4085530 Feb 12, 2019