Randomness 1.14.0

Changed

• A bare dice formula in an rdm: span now rolls. `rdm:2d10`
  used to render the literal text "2d10" — no roll, no error, nothing
  to suggest anything was wrong. It was the trap waiting for anyone
  converting dice: spans, where the formula is the whole
  expression. An inline call that is nothing but a dice formula is now
  treated as `rdm:{2d10}`, and an omitted die count is filled in
  (`rdm:d20`) for the same reason.

  The test is deliberately narrow: the whole expression must be a
  formula, so `rdm:you take 2d6` is still literal text, and no
  expression containing generator syntax ([@table], {…}, #tag,
  |) can match. Bracing is native, so `rdm:3d6>=10` means what
  `rdm:{3d6>=10}` means — 1 when the total reaches 10 — rather
  than the success-counting a dice: span would read it as. Thanks to
  Anna_B_Meyer for walking into it.