Paging Refactoring beim Rest

...dmin/exercise-form/task-select/task-select.component.html

...-admin/exercise-form/task-select/task-select.component.ts

...cise-admin/exercise-form/task-select/task-select.store.ts

...s/task-pool/components/task-list/task-list.component.html

...ges/task-pool/components/task-list/task-list.component.ts

...s/pages/task-pool/components/task-list/task-list.store.ts

...k-pools/components/task-pool-list/task-pool-list.store.ts

...web/src/app/tasks/shared/operators/task-pool.operators.ts