v1.2.0

• Added depth mode - see README.md.
• Added gradient mode for use with RGB palette.
• Added stats widget - see README.md.
• Added new controls: Ctrl-C for exiting, l (lowercase L) for redraw, s for showing the stats widget.
• Added new CLI flags:
  • -g, --gradient - enable gradient mode.
  • --gradient-step - step between gradient transitions.
  • -d, --depth-mode - enable depth mode.
  • --layer-max-drawn-pieces - maximal number of pieces in the current layer (depth mode).
  • -F, --darken-factor - how much to darken pipe pieces in previous layers? (depth mode).
  • -M, --darken-min - the color to gradually darken to (depth mode).
  • -s, --show-stats - show the stats widget
• Changed default FPS from 20 to 24 frames.