tracker-miners: use icu for charset detection
tracker-miners: use icu for charset detection

enca wasn't updated since 2016 and at least Debian and Arch are using
icu as a backend too.

also take over maintainership

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages