Misc code fixes

src/main/java/com/gmail/nossr50/events/skills/abilities/McMMOPlayerAbilityEvent.java

@@ -6,7 +6,7 @@ import com.gmail.nossr50.events.skills.McMMOPlayerSkillEvent;
 import org.bukkit.entity.Player;
 
 public class McMMOPlayerAbilityEvent extends McMMOPlayerSkillEvent {
-    private SuperAbilityType ability;
+    private final SuperAbilityType ability;
 
     protected McMMOPlayerAbilityEvent(Player player, PrimarySkillType skill) {
         super(player, skill);

src/main/java/com/gmail/nossr50/events/skills/alchemy/McMMOPlayerBrewEvent.java

@@ -9,7 +9,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
 
 public class McMMOPlayerBrewEvent extends McMMOPlayerSkillEvent implements Cancellable {
-    private BlockState brewingStand;
+    private final BlockState brewingStand;
 
     private boolean cancelled;
 

src/main/java/com/gmail/nossr50/events/skills/fishing/McMMOPlayerMagicHunterEvent.java

@@ -7,7 +7,7 @@ import org.bukkit.inventory.ItemStack;
 import java.util.Map;
 
 public class McMMOPlayerMagicHunterEvent extends McMMOPlayerFishingTreasureEvent {
-    private Map<Enchantment, Integer> enchants;
+    private final Map<Enchantment, Integer> enchants;
 
     public McMMOPlayerMagicHunterEvent(Player player, ItemStack treasure, int xp, Map<Enchantment, Integer> enchants) {
         super(player, treasure, xp);

src/main/java/com/gmail/nossr50/events/skills/repair/McMMOPlayerRepairCheckEvent.java

@@ -10,9 +10,9 @@ import org.bukkit.inventory.ItemStack;
  * Called just before a player repairs an object with mcMMO.
  */
 public class McMMOPlayerRepairCheckEvent extends McMMOPlayerSkillEvent implements Cancellable {
-    private short repairAmount;
-    private ItemStack repairMaterial;
-    private ItemStack repairedObject;
+    private final short repairAmount;
+    private final ItemStack repairMaterial;
+    private final ItemStack repairedObject;
     private boolean cancelled;
 
     public McMMOPlayerRepairCheckEvent(Player player, short repairAmount, ItemStack repairMaterial, ItemStack repairedObject) {

src/main/java/com/gmail/nossr50/events/skills/salvage/McMMOPlayerSalvageCheckEvent.java

@@ -10,9 +10,9 @@ import org.bukkit.inventory.ItemStack;
  * Called just before a player salvages an item with mcMMO.
  */
 public class McMMOPlayerSalvageCheckEvent extends McMMOPlayerSkillEvent implements Cancellable {
-    private ItemStack salvageItem;
-    private ItemStack salvageResults;
-    private ItemStack enchantedBook;
+    private final ItemStack salvageItem;
+    private final ItemStack salvageResults;
+    private final ItemStack enchantedBook;
     private boolean cancelled;
 
     public McMMOPlayerSalvageCheckEvent(Player player, ItemStack salvageItem, ItemStack salvageResults, ItemStack enchantedBook) {

src/main/java/com/gmail/nossr50/events/skills/unarmed/McMMOPlayerDisarmEvent.java

@@ -7,7 +7,7 @@ import org.bukkit.event.Cancellable;
 
 public class McMMOPlayerDisarmEvent extends McMMOPlayerSkillEvent implements Cancellable {
     private boolean cancelled;
-    private Player defender;
+    private final Player defender;
 
     public McMMOPlayerDisarmEvent(Player defender) {
         super(defender, PrimarySkillType.UNARMED);