#432 Injector improvements

- Separate FieldInjection from default fallback for no-Inject public no-args constructor classes
- Make CommandInitializer a normal, instantiable service
- Add various injections instead of fetching through command service

src/main/java/fr/xephi/authme/command/executable/email/AddEmailCommand.java

@@ -3,8 +3,10 @@ package fr.xephi.authme.command.executable.email;
 import fr.xephi.authme.command.CommandService;
 import fr.xephi.authme.command.PlayerCommand;
 import fr.xephi.authme.output.MessageKey;
+import fr.xephi.authme.process.Management;
 import org.bukkit.entity.Player;
 
+import javax.inject.Inject;
 import java.util.List;
 
 /**
@@ -12,6 +14,9 @@ import java.util.List;
  */
 public class AddEmailCommand extends PlayerCommand {
 
+    @Inject
+    private Management management;
+
     @Override
     public void runCommand(Player player, List<String> arguments, CommandService commandService) {
         String email = arguments.get(0);
@@ -19,7 +24,7 @@ public class AddEmailCommand extends PlayerCommand {
 
         if (email.equals(emailConfirmation)) {
             // Closer inspection of the mail address handled by the async task
-            commandService.getManagement().performAddEmail(player, email);
+            management.performAddEmail(player, email);
         } else {
             commandService.send(player, MessageKey.CONFIRM_EMAIL_MESSAGE);
         }

src/main/java/fr/xephi/authme/command/executable/email/ChangeEmailCommand.java

@@ -2,8 +2,10 @@ package fr.xephi.authme.command.executable.email;
 
 import fr.xephi.authme.command.CommandService;
 import fr.xephi.authme.command.PlayerCommand;
+import fr.xephi.authme.process.Management;
 import org.bukkit.entity.Player;
 
+import javax.inject.Inject;
 import java.util.List;
 
 /**
@@ -11,11 +13,14 @@ import java.util.List;
  */
 public class ChangeEmailCommand extends PlayerCommand {
 
+    @Inject
+    private Management management;
+
     @Override
     public void runCommand(Player player, List<String> arguments, CommandService commandService) {
         String playerMailOld = arguments.get(0);
         String playerMailNew = arguments.get(1);
 
-        commandService.getManagement().performChangeEmail(player, playerMailOld, playerMailNew);
+        management.performChangeEmail(player, playerMailOld, playerMailNew);
     }
 }

src/main/java/fr/xephi/authme/command/executable/email/RecoverEmailCommand.java

@@ -29,11 +29,13 @@ public class RecoverEmailCommand extends PlayerCommand {
     @Inject
     private PlayerCache playerCache;
 
+    @Inject
+    private AuthMe plugin;
+
     @Override
     public void runCommand(Player player, List<String> arguments, CommandService commandService) {
         final String playerMail = arguments.get(0);
         final String playerName = player.getName();
-        final AuthMe plugin = commandService.getAuthMe();
 
         if (plugin.mail == null) {
             ConsoleLogger.showError("Mail API is not set");