Merge remote-tracking branch 'upstream/master'

src/app/+search-page/search-options.model.ts

src/app/+search-page/search-page-routing.module.ts

src/app/+search-page/search-page.component.html

src/app/+search-page/search-page.component.scss

src/app/+search-page/search-page.component.ts

src/app/+search-page/search-page.module.ts

src/app/+search-page/search-result.model.ts

...+search-page/search-results/search-results.component.html

.../+search-page/search-results/search-results.compontent.ts

src/app/+search-page/search.service.ts

src/app/app-routing.module.ts

src/app/core/cache/builders/remote-data-build.service.ts

...ollection-search-result/collection-search-result.model.ts

.../community-search-result/community-search-result.model.ts

...st-element/item-search-result/item-search-result.model.ts

...sult-list-element/search-result-list-element.component.ts

src/app/search/search.module.ts

src/app/shared/search-form/search-form.component.ts