Added get reward command

Store if a player obtained their reward already

src/main/java/com/alttd/altitudequests/database/Database.java

@@ -97,6 +97,7 @@ public class Database {
                     "quest_variant VARCHAR(36) NOT NULL, " +
                     "step_1_progress INT NOT NULL, " +
                     "step_2_progress INT NOT NULL, " +
+                    "reward_received BIT(1) NOT NULL, " +
                     "PRIMARY KEY (UUID)" +
                     ")";
             getDatabase().getConnection().prepareStatement(sql).executeUpdate();