Revert "Enable ThemeChooser (2)"

This reverts commit 9a3f73659936654f06478ad1894b4be92c0dc07b.
Revert "Enable ThemeChooser"

This reverts commit b2b04d077ae2ec43dfca12672f42384119a1443e.
Revert "Delete ThemeSettings.java"

This reverts commit 9b5f9a696a5627576548b1d3631adb595284c60a.
Revert "Enable ThemeChooser"

This reverts commit 8dd44a9840d8b59ebe98035908e475ebbea744f5.