More maintenance

Created by: sonninnos

New:

• Filepath tag (CE) for forcing Cycle-exact (core option does nothing)
• Reduced RETRO_ENVIRONMENT_SET_GEOMETRY calls with Zoom Mode

Horizontal centering changes:

• Added hacks for:
  • North & South (slightly not centered)
  • Zool (menu jumps left & right)
• Fixed offset:
  • Toki (not centered)

Please report any regressions!

Cleanups:

• Changed // Comments to /* Comments */
• Reorganized and renamed libretro variables for better readability
• Simplified hotkey mapper
• Removed debugger & internal keymap = core sized reduced ~110kB
• Minor statusbar pixel adjustments
• Separated horizontal + vertical centering functions