0.7.3

Changelog

• Added "p" command to jump to playing station / loaded playlist.
• Added two more themes (dark_16_colors and light_16_colors).
• Improved black_on_white theme.
• On a 8 color terminal, the fall-back theme will be "light",
  if "light_16_colors" is default.
• Exiting if terminal cannot display colors.
• Fixed player selection error screen.
• Fixed a regression which might appear when loading a playlist