Fixed hundreds of small issues, code improvements, typos, ...

pandalib-db/src/main/java/fr/pandacube/lib/db/DB.java

@@ -227,7 +227,7 @@ public final class DB {
      */
     public static <E extends SQLElement<E>> E getFirst(Class<E> elemClass, SQLWhere<E> where, SQLOrderBy<E> orderBy, Integer offset) throws DBException {
         SQLElementList<E> elements = getAll(elemClass, where, orderBy, 1, offset);
-        return (elements.size() == 0) ? null : elements.get(0);
+        return (elements.isEmpty()) ? null : elements.get(0);
     }
 
     /**

pandalib-db/src/main/java/fr/pandacube/lib/db/SQLType.java

@@ -42,7 +42,7 @@ public class SQLType<T> {
 
     @Override
     public boolean equals(Object obj) {
-        return obj instanceof SQLType o
+        return obj instanceof SQLType<?> o
                 && toString().equals(o.toString());
     }