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

This reverts commit 368dc02f32a72961b1c35bca1ce8d0854ba32352.
Revert "New Theme Engine [2/6] CM11 Themes"

This reverts commit ad12007d8d9250aaad4f17e3b8705f48f297acd5.