Rework the Morbus Clock to use a screen rather than text to display its information. This rework is part of a push for a vanilla-ish feel for the mod.

Progress on feature:

• 'Is Imminent?' checkmark functionality
  • Basic functionality;
  • Sync to gamerule.
• Day countdown functionality
  • Basic functionality
  • Sync to world time;
  • Render '0' instead of blank on slot if countdown is too low for said slot's digit.
• Render tooltip showing same information as the clock, as the info might be rendered too small on certain gui scales;
• Render tooltip explaining Morbus Spreading when the '?' symbol is hovered;
• Disable REI on Morbus Clock screen;
• Funny easter egg (not fun if I tell you what it is!);
• Texture.

Master issue: #52