penguinolog / urwid / 42204248116

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Rebuild the calc example: two tabs, big digits, themes

examples/calc.py is a new calculator, written for learning how to build a TUI.
The calculator logic is plain Python, kept apart from the urwid user interface.

- Normal tab: decimal arithmetic, buttons laid out as on a numeric keypad.
- Programmer tab: 32-bit integers in base 2, 8, 10 or 16, on a fixed hex keypad.
- BigText display in the Thin 3x3 font; keyboard and numeric keypad input.
- Theme pop-up (PopUpLauncher): Monokai dark or bright, previewed at once,
  kept on OK, reverted on Cancel or Esc.
- Help dialog in an OverlayStack; F1 help, F2 theme, Esc clears, F8 exits.

examples/pop_up.py is removed: the Theme button shows the same PopUpLauncher
use. The docs list calc.py with new screenshots, and no longer name it as a
user of the CGI web display, which it does not support any more.

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