Zoom mode rework, Remapping fixes

Created by: sonninnos

Major:

• Zoom mode can also do horizontal cropping
  • Horizontal + vertical enabled by default
  • Please confirm that VKBD touch is bueno with all sizes!
• Remapping adjustments
  • Special hotkeys can override VKBD functions

Bonus:

• Prefixes for hidden core options added
• Improved M3U generation sorting
• Waiting blits disabled by default
• Markdown oopsies in README fixed