Add support for archiving lists and namespaces (#73)

Use fancy checkbox for archiving namespace

Show is archived badge for namespaces

Fix is archived badge in navigation bar

Add check to filter out archived lists or namespaces

Show if a list is archived in menu

Hide edit task if the list is archived

Hide marking tasks as done if the list is archived

Show is archived message on list

Add archiving a list

Add archiving a namespace

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/73

src/models/list.js

@@ -27,6 +27,7 @@ export default class ListModel extends AbstractModel {
 			owner: UserModel,
 			tasks: [],
 			namespaceID: 0,
+			is_archived: false,
 
 			created: null,
 			updated: null,

src/models/namespace.js

@@ -23,6 +23,7 @@ export default class NamespaceModel extends AbstractModel {
 			description: '',
 			owner: UserModel,
 			lists: [],
+			is_archived: false,
 
 			created: null,
 			updated: null,