• Update to 0.70.0

Config files are now installed both into the DATADIR (implemented
upstream in this version) and ETCDIR (as always been done by the
port). I'm going to discuss this with upstream ([1]) as ETCDIR
surely looks more suitable, so for now this duplication is indended.

[1] https://github.com/uncrustify/uncrustify/commit/ea6950086657de0ad12bc098f169a992407889ca