Release 2.27.16

• Improve status info in auxiliary text for compose completions and related candidates: When compose completions or related candidates are shown, use different auxiliary text to make it more obvious that a “special” lookup table is shown.
• Make compose completions work when the option “☑️ Enable suggestions by key (Default is the Tab key)” is used (Resolves: #619)
• Speedup for itb_pango: Create a Gtk.label and Pango.Layout only once and reuse it, Seems to make get_fonts_used_for_text() about 33% faster.