Added function `xkb_components_names_from_rules()` to compute <abbr title="Keycodes, Compatibility, Geometry, Symbols, Types">KcCGST</abbr> keymap components from <abbr title="Rules, Model, Layout, Variant, Options">RMLVO</abbr> names resolution. This mainly for *debugging* purposes and to enable the `--kccgst` option in the tools.