Fixed errors after upgrade to angular 7

...lection-page/collection-form/collection-form.component.ts

...community-page/community-form/community-form.component.ts

src/app/community-list-page/community-list-adapter.ts

src/app/community-list-page/community-list-service.ts

src/app/core/data/bitstream-format-data.service.ts

src/app/core/data/data.service.ts

src/app/core/data/request.service.ts

src/app/core/index/index.selectors.ts

src/app/core/json-patch/json-patch-operations.service.ts

src/app/core/services/route.service.ts

.../shared/comcol-forms/comcol-form/comcol-form.component.ts

...ic-form-ui/ds-dynamic-form-control-container.component.ts

...s-dynamic-form-ui/models/date-picker/date-picker.model.ts

...er/ds-dynamic-form-ui/models/ds-dynamic-qualdrop.model.ts

src/app/shared/form/builder/form-builder.service.ts

src/app/shared/menu/menu.service.ts

src/app/shared/sidebar/filter/sidebar-filter.service.ts

src/app/submission/submission.service.ts