Resolve "Use PageUtil class in librador"

Deletes local PageUtil and uses librador PageUtil.

Closes #216 (closed)

src/main/java/nl/tudelft/tam/controller/utility/PageUtil.java

-/*
- * TAM
- * Copyright (C) 2021 - Delft University of Technology
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package nl.tudelft.tam.controller.utility;
-
-import java.util.List;
-
-import org.springframework.data.domain.Page;
-import org.springframework.data.domain.PageImpl;
-import org.springframework.data.domain.PageRequest;
-import org.springframework.data.domain.Pageable;
-
-public class PageUtil {
-
-	public static <T> Page<T> pageFromList(List<T> list, Pageable pageable) {
-		int total = list.size();
-		int startIndex = pageable.getPageNumber() * pageable.getPageSize();
-		startIndex = startIndex > total ? 0 : startIndex;
-		int endIndex = Math.min(startIndex + pageable.getPageSize(), total);
-		List<T> listOnPage = list.subList(startIndex, endIndex);
-
-		return new PageImpl<>(
-				listOnPage,
-				PageRequest.of(pageable.getPageNumber(), pageable.getPageSize()),
-				total);
-	}
-
-}