Now, it properly integrates installed extensions by automatically
generating a separate dconf keyfile and enabling them individually.
There is also an additional option for setting the preferred terminal
emulator instead of manually setting certain things on the appropriate
keyfile (though, it doesn't work so...).
I think this is better for separating modules explicitly. This is also
considered as there are similar objects between modules (e.g., NixOS
and home-manager modules and users).
Revert users module to old position
