Revert "CM11 Themes: Store hash codes for target and overlay in idmap"

This reverts commit d1e61319af5486294a664b6e9d2f2b870e5732b6.
Revert "New Theme Engine [2/6] CM11 Themes"

This reverts commit bd587fa33424555026b73a254eef66ef6fcbe0fe.
Revert "Runtime resource overlay, iteration 2"

This reverts commit 787fe87d47c1b7fdac5926974f5bf39fb2d22765.
Revert "New command line tool 'idmap'"

This reverts commit 3ff9c505428f43959467188f7a05fe4c8147a1ce.