Implements support for using the grave key (`) as a hotkey modifier
in Barrier, enabling hotkey combinations like Grave+1, Grave+2, etc.
Key changes:
- Add XK_grave case to getModifierBitForKeySym() for XKB support
- Add fallback mapping for grave modifier to Mod4 in XKB path
- Include KeyModifierGrave in allowed modifiers for hotkey registration
- Add setup documentation for required X11 modifier mapping
Requires running: xmodmap -e "add mod4 = grave"
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Co-Authored-By: Claude <noreply@anthropic.com>
danielsuss