Ad one more --word-diff alias for character mode

dotfiles/gittum/main.gitconfig

   sh = show
   sw = show --word-diff=color
   swp = show --word-diff=porcelain
+  swc = show --word-diff=color --word-diff-regex=.
   who = ! ~/.gittum/bin/who
   whoo = ! ~/.gittum/bin/whoo
   xtragc = ! ~/.gittum/bin/xtragc