Randomness 1.21.0

Added

• Quarter-turn decks. A deck can now turn its cards any of
  four ways, for square cards with a reading on each edge (Story
  Engine) or random map tiles. In the Decks tab, Turns picks
  half (upright/reversed, as before) or quarter, and the old
  Reversed chance % field is now Turn chance % — the odds a
  draw is turned at all; a quarter-turned card lands on right,
  reversed or left with equal odds and its image rotates to
  match. In .rdm files, Turn: quarter (optionally Turn: quarter 25%) does the same for in-generator decks and seeds a folder
  deck's defaults; Flip: still works and means Turn: half.
  Card text can branch on {$facing} (upright / right /
  reversed / left) or the new {$turn} (0–3 quarter turns
  clockwise). Existing deck.json files need no change.