Gtk: ignore the keyboard layout whereever possible (refs #5)

* Eg. when typing with a Russian layout, CTRL+I will always insert ^I.
* Works with all of the start-state command Ex, Fx, ^x commands and
  string building constructs.
  This is exactly where process_edit_cmd_cb() case folds case-insensitive
  characters.
  The corresponding state therefore sets an is_case_insensitive flag now.
* Does not yet work with anything embedded into Q-Register specifications.
  This could only be realized with a new state callback (is_case_insensitive()?)
  that chains to the Q-Register and string building states recursively.
* Also it doesn't work with Ё on my Russian phonetic layout,
  probably because the ANSI caret on that same key is considered dead
  and not returned by gdk_keyval_to_unicode().
  Perhaps we should directly wheck the keyval values?
* Whenever a non-ANSI key is pressed in an allowed state,
  we try to check all other keyvals that could be produced by the same
  hardware keycode, ie. we check all groups (keyboard layouts).

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