deprecate splitter in std.array

use static import

update PR
std.encoding: clean imports
std.utf: clean imports
Merge pull request #2690 from 9il/splitter

deprecate splitter in std.array
Merge pull request #2720 from 9il/utf

std.utf: clean imports
Merge pull request #2719 from 9il/encoding2

std.encoding: clean imports