Changes in IBus 1.5.15

Fix GVariant leaks (Eric R. Schulz) 997e5cb
ui/gtk3: Fix radio buttons on Property Panel (fujiwarat) ceb6a9b
Update translations (fujiwarat) 708e5e5
Fix warning messages during panel resizes (fujiwarat) af66ace
src: Hide lookup table if emoji annotation does not hit (fujiwarat) e795eda
src: Enable to type digit to commit emoji on lookup window (fujiwarat) 4d86e59
src: Enable PageUp, PageDown, CandidateClick buttons with emoji lookup (fujiwarat) faf5e3c
ui/gtk3: support scroll event in candidates panel (Peng Wu) 52b7272
src: Avoid emoji typing during Unicode typing (fujiwarat) f80dcc9
ui/gtk3: Fix panel CSS format for GTK 3.22 (fujiwarat) aacf5ad
util/IMdkit: Fix the range of memset() in i18nIc.c (fujiwarat) 371535b
ui/gtk3: Refactor color of a selected candidate on lookup window (fujiwarat) bdc83bc
ui/gtk3: Free normal_color in CandidateArea (fujiwarat) b8f5553
ui/gtk3: Refactor to set panel icon (fujiwarat) b498ff5
ui/gtk3: Fix typo in switcher.get_input_context_path() (fujiwarat) fcb90f7
bus: fix service file when --disable-xim is specified (Marc-Antoine Perennou) 993289f
Fix memory leak in IBus.Bus.get_global_engine() (Eric R. Schulz) 0a24481
Move emoji implementation from IBusEngineSimple to IBusPanel (fujiwarat) 02d99aa
setup: Set emoji preview text on font setting (fujiwarat) 13bf503
Add 'ibus emoji' command for no ibus panel desktops (fujiwarat) c37989a
Release 1.5.15 (fujiwarat) f7f3bc8
Fix a build failure with --disable-emoji-dict (fujiwarat) 641c3cb