Squashed 'simsala/' changes from 12ce69e..18a924d

18a924d Moved simsala classes into their own subdirectory

git-subtree-dir: simsala
git-subtree-split: 18a924d57268375ece776681623721c4b059ef2c
Merge commit '0d0b2066c29c041015ae130aee60456c1dd0caa7'