fix: Fix violations of Sonar rule 2057

src/main/java/spoon/javadoc/internal/Javadoc.java

@@ -34,6 +34,7 @@
 * writing this comment does not contain any block tags (such as <code>@see AnotherClass</code>)
 */
 public class Javadoc implements Serializable {
+	private static final long serialVersionUID = 1L;
 
 	private JavadocDescription description;
 	private List<JavadocBlockTag> blockTags;

src/main/java/spoon/javadoc/internal/JavadocBlockTag.java

@@ -27,6 +27,7 @@
 * </code>
 */
 public class JavadocBlockTag implements Serializable {
+	private static final long serialVersionUID = 1L;
 
 	private CtJavaDocTag.TagType type;
 	private JavadocDescription content;

src/main/java/spoon/javadoc/internal/JavadocDescription.java

@@ -22,6 +22,7 @@
 	* A javadoc text, potentially containing inline tags.
 	*/
 	public class JavadocDescription implements Serializable {
+	private static final long serialVersionUID = 1L;
 
 	private List<JavadocDescriptionElement> elements;
 

src/main/java/spoon/javadoc/internal/JavadocInlineTag.java

@@ -22,6 +22,7 @@
 * <p>For example <code>{@link String}</code>
 */
 public class JavadocInlineTag implements JavadocDescriptionElement, Serializable {
+	private static final long serialVersionUID = 1L;
 
 	/** Return the next word of the string, in other words it stops when a space is encountered. */
 	public static String nextWord(String string) {

src/main/java/spoon/javadoc/internal/JavadocSnippet.java

@@ -23,6 +23,7 @@
 * have two snippets: one before and one after the inline tag (<code>{@link String}</code>).
 */
 public class JavadocSnippet implements JavadocDescriptionElement, Serializable {
+	private static final long serialVersionUID = 1L;
 	private String text;
 
 	public JavadocSnippet(String text) {

src/main/java/spoon/support/comparator/CtLineElementComparator.java

@@ -17,6 +17,7 @@
  * source files.
  */
 public class CtLineElementComparator implements Comparator<CtElement>, Serializable {
+	private static final long serialVersionUID = 1L;
 
 	/**
 	 * Returns 0 if o1 has the same position as o2, or both positions are invalid and o1.equals(o2).

src/main/java/spoon/support/comparator/DeepRepresentationComparator.java

@@ -16,6 +16,7 @@
  * Compares based on a toString representation.
  */
 public class DeepRepresentationComparator implements Comparator<CtElement>, Serializable {
+	private static final long serialVersionUID = 1L;
 
 	@Override
 	public int compare(CtElement o1, CtElement o2) {

src/main/java/spoon/support/reflect/CtExtendedModifier.java

@@ -20,6 +20,7 @@
  * ModifierKind in kept for sake of full backward-compatibility.
  */
 public class CtExtendedModifier implements SourcePositionHolder, Serializable {
+	private static final long serialVersionUID = 1L;
 	private boolean implicit;
 	private ModifierKind kind;
 	private SourcePosition position;

src/main/java/spoon/support/util/ModelList.java

@@ -213,6 +213,7 @@ public int lastIndexOf(Object o) {
 	 * See https://docs.oracle.com/javase/7/docs/api/java/util/AbstractList.html#modCount
 	 */
 	private static class InternalList<T> extends ArrayList<T> {
+		private static final long serialVersionUID = 1L;
 		InternalList(int initialCapacity) {
 			super(initialCapacity);
 		}