-Previous version used emojis for brightness and volume icons, which may
be inconsistent across devices and do not fit well with other parts of UI
(Frankly, previous version was more informative than eye-candy)
-This commit replaces old version with circular progress bar that shows
current value (before conversion). Gesture mode (volume/brightness) is
indicated by icon that changes between (4/3) modes according to current
value
-Text information about current value was removed, because with progress
bar present it does not add any real value to UI.
