[GIT] Cleanup merged branches

# All merged branches except 'master' and '0.0', '0.00', '00.0' or '00.00'
git fetch origin && git branch --merged master | grep -v -E "^([ \*]{2})(master|[0-9]{1,2}.[0-9]{1,2})$" | xargs -n 1 git branch -d
git fetch origin && git branch --merged 9.7 | grep -v -E "^([ \*]{2})(master|[0-9]{1,2}.[0-9]{1,2})$" | xargs -n 1 git branch -d
git fetch origin && git branch --merged 9.6 | grep -v -E "^([ \*]{2})(master|[0-9]{1,2}.[0-9]{1,2})$" | xargs -n 1 git branch -d
git remote prune origin