fix mojibake reversion in display of utf8

When displaying a ByteString like "💕", safeOutput operates on
individual bytes like "\240\159\146\149" and isControl '\146' = True,
so it got truncated to just "\240".

So, only treat the low control characters, and DEL, as control
characters.

Also split Utility.Terminal out of Utility.SafeOutput. The latter needs
win32, but Utility.SafeOutput is used by Control.Exception, which is
used by Setup.

Sponsored-by: Nicholas Golder-Manning on Patreon

Command/Find.hs

@@ -19,7 +19,7 @@ import Types.Key
 import Git.FilePath
 import qualified Utility.Format
 import Utility.DataUnits
-import Utility.SafeOutput
+import Utility.Terminal
 
 cmd :: Command
 cmd = withAnnexOptions [annexedMatchingOptions] $ mkCommand $