UI Enhancements

[dbent]

• Computer LED activity light
  • Off: black
  • Running: green
  • Halted: orange
  • On Fire: red
• Floppy drive LED activity light
  • Off: black
  • Seeking: orange
  • Reading/Writing: green
• Floppy drive seek/read/write noise
• According to the specs the LEM1802 should take about 1 second to "start up", could be implemented with a gradual brightening or CRT effect.
• SPED-3 flickering effect