v1.0.16

• Fix padding between variable names and values in "vars" popup.
• Fix "dated yet pricey" theme output display background to retro LCD colour.
• Add some settings to increase output display size on small screens:
  • option to increase the size of the output display, and
  • option to hide most or all buttons, instead relying mostly on the on-screen keyboard for text input.
• Add some debug settings for unreadable text or missing LaTeX in output display.