simplify management of list and grid views and keep only one kind

Summary:
Factor all list views into a single one to decrease duplicated code.

fix display of single album list view

we now have a list and a grid generic view

DataListView is the new generic list view

Next one will be the file manager view.

Test Plan: tests are OK and manual testing shows no regressions.

Reviewers: Elisa

Differential Revision: https://phabricator.kde.org/D21774