[Interfaces] Refactored IShortcutProxy to a separate header.
[Core] Code style fixes, use Util::Stlize().
[Util] Code style fixes.
[Poshuku] Removed Find keyboard sequence for #1795.
[Util] Added CreateShortcuts() to shortcuts/util for #1795.
[Util] -gui depends on -shortcuts now for #1795.
[Util] Removed QtDebug dep.
[Core] Register Ctrl+F/Ctrl+F3 shortcuts for #1795.
[Util] Set standard find shortcut for #1795.