Log Message:
spleen: update to 2.0.0.

Spleen 2.0.0 (2023-05-28)

- Add full support for CP437 (IBM PC) in the 8x16, 16x32, and 32x64 versions
- Add a cp437 directory with BDF files using the IBM Code page 437 encoding
- Add a DOS version, as a COM file (SPLEEN.COM) setting the font to Spleen
- Add various arrows and triangle-headed arrows in the 8x16, 16x32, and
  32x64 versions
- Shift bullet character at correct position (U+2022) in the 32x64 version
- Add union symbol in the 8x16, 16x32, and 32x64 versions
- Do not remove specimen.png in the clean target