Finalized some fields, removed redundant code, various other fixes

src/main/java/fr/xephi/authme/events/AuthMeAsyncPreLoginEvent.java

@@ -13,7 +13,7 @@ import org.bukkit.event.HandlerList;
 public class AuthMeAsyncPreLoginEvent extends Event {
 
     private static final HandlerList handlers = new HandlerList();
-    private Player player;
+    private final Player player;
     private boolean canLogin = true;
 
     /**

src/main/java/fr/xephi/authme/events/AuthMeTeleportEvent.java

@@ -11,9 +11,9 @@ import org.bukkit.entity.Player;
  */
 public class AuthMeTeleportEvent extends CustomEvent {
 
-    private Player player;
+    private final Player player;
     private Location to;
-    private Location from;
+    private final Location from;
 
     /**
      * Constructor for AuthMeTeleportEvent.

src/main/java/fr/xephi/authme/events/FirstSpawnTeleportEvent.java

@@ -11,9 +11,9 @@ import org.bukkit.entity.Player;
  */
 public class FirstSpawnTeleportEvent extends CustomEvent {
 
-    private Player player;
+    private final Player player;
     private Location to;
-    private Location from;
+    private final Location from;
 
     /**
      * Constructor for FirstSpawnTeleportEvent.

src/main/java/fr/xephi/authme/events/ProtectInventoryEvent.java

@@ -12,11 +12,11 @@ import org.bukkit.inventory.ItemStack;
  */
 public class ProtectInventoryEvent extends CustomEvent {
 
-    private ItemStack[] storedinventory;
-    private ItemStack[] storedarmor;
+    private final ItemStack[] storedinventory;
+    private final ItemStack[] storedarmor;
     private ItemStack[] emptyInventory = null;
     private ItemStack[] emptyArmor = null;
-    private Player player;
+    private final Player player;
 
     /**
      * Constructor for ProtectInventoryEvent.

src/main/java/fr/xephi/authme/events/RegisterTeleportEvent.java

@@ -12,9 +12,9 @@ import org.bukkit.entity.Player;
  */
 public class RegisterTeleportEvent extends CustomEvent {
 
-    private Player player;
+    private final Player player;
     private Location to;
-    private Location from;
+    private final Location from;
 
     /**
      * Constructor for RegisterTeleportEvent.

src/main/java/fr/xephi/authme/events/SpawnTeleportEvent.java

@@ -11,10 +11,10 @@ import org.bukkit.entity.Player;
  */
 public class SpawnTeleportEvent extends CustomEvent {
 
-    private Player player;
+    private final Player player;
     private Location to;
-    private Location from;
-    private boolean isAuthenticated;
+    private final Location from;
+    private final boolean isAuthenticated;
 
     /**
      * Constructor for SpawnTeleportEvent.