According to the layout XML format, keys prefixed with "loc " should
have an option to hide or show them. Add a property to facilitate this
configuration. Keep the array sorted so it can be binary searched for
the existence of an element.
Having multiple input methods at once causes behaviour defined by the
Wayland compositor. In a recent update by Phoc, the most recently
started input method would take priority to demonstrate the instability.
Add a configuration option so the Wayland input method can be disabled
to accommodate a second input method.
Also update the README with the new option.
