0.18.1

Improved:

• Performance has been further improved (from x10 to x100, again).
  • How terrible code I have written...
• Off-screen items are no longer rendered.
• Diff checks for rendering have been speeded up.
• Observing items is now processed by a single observer.
• Items which are gathering information are now indicated with dog ears of accent colour.
• Terser has been introduced for more optimisation.
  • If you notice some behavioural change, feel free to inform me, please!