Toggle icon settings in tl_metamodel_attribute -> tl_metamodel_dcasetting

## Issue description

As an addendum to #12.

We should move the following settings from `tl_metamodel_attribute` to `tl_metamodel_dcasetting`:
- [ ] `check_publish`
- [ ] `check_inverse`
- [ ] `check_listview`
- [ ] `check_listviewicon`
- [ ] `check_listviewicondisabled`


