Remove Identifier.ClrMameProDat code
Squashed 'Identifiers/Identifier.ClrMameProDat/' content from commit 3a22363

git-subtree-dir: Identifiers/Identifier.ClrMameProDat
git-subtree-split: 3a2236366709e098520409fe53eff9a1a239cf4d
Merge commit '7eecc1d47b86e115f38cf70b20ce85c3a38b47a0' as 'Identifiers/Identifier.ClrMameProDat'