penguinolog / urwid / 40524820237

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Complete the BigText fonts and add Thin 5x4 (#1521)

Every BigText font that has letters now draws all ASCII letters it
covers, digits, punctuation and the space, and no font draws two
characters the same.

- New Thin5x4Font ("Thin 5x4"): box-drawing, 4 rows, all printable ASCII.
- Half Block 6x5 and Half Block Heavy 6x5 get A-Z, a-z and the 29
  punctuation characters they lacked.
- Thin 4x3 gets & ( ) < > @ { | } ~; Sextant 3x3 gets { | } ~.
- 0 is slashed or dotted in the Half Block 5x4, 6x5 and Heavy 6x5 fonts,
  Thin 4x3 S no longer matches 5, and Half Block 5x4 I and | no longer
  match l.
- Half Block 5x4 ` slopes from top left to bottom right; its block held
  a second, apostrophe-shaped ` that was always used instead.
- Tests check that no font repeats a glyph and that each font renders the
  character sets it covers at its full height.
- The bigtext screenshots are regenerated; the key script presses Down
  once more so they still show Thin 6x6 and Half Block 5x4.

5652 of 6390 branches covered (88.45%)

Branch coverage included in aggregate %.

6 of 6 new or added lines in 1 file covered. (100.0%)

14091 of 15282 relevant lines covered (92.21%)

14.44 hits per line