Refactorings - prepare to remove FoundCommandResult

- Reduce tight coupling by passing list of available commands as param to CommandHandler
- Split command processing method into several smaller ones
- Remove unfinished logic for unlimited command arguments (reason: was not implemented and not used, probably needs another way to handle it once the need for it arises)
- Create test for CommandHandler

src/main/java/fr/xephi/authme/command/help/HelpPrinter.java

@@ -5,7 +5,6 @@ import fr.xephi.authme.command.CommandArgumentDescription;
 import fr.xephi.authme.command.CommandDescription;
 import fr.xephi.authme.command.CommandParts;
 import fr.xephi.authme.command.CommandPermissions;
-import fr.xephi.authme.command.CommandUtils;
 import fr.xephi.authme.permission.PermissionNode;
 import fr.xephi.authme.util.StringUtils;
 import org.bukkit.ChatColor;
@@ -77,10 +76,6 @@ public class HelpPrinter {
             // Print the syntax
             sender.sendMessage(argString.toString());
         }
-
-        // Show the unlimited arguments argument
-        if (!command.hasMaximumArguments())
-            sender.sendMessage(" " + ChatColor.YELLOW + ChatColor.ITALIC + "... : " + ChatColor.WHITE + "Any additional arguments." + ChatColor.GRAY + ChatColor.ITALIC + " (Optional)");
     }
 
     /**

src/main/java/fr/xephi/authme/command/help/HelpSyntaxHelper.java

@@ -61,11 +61,6 @@ public final class HelpSyntaxHelper {
             sb.append(ChatColor.ITALIC).append(formatArgument(arg));
         }
 
-        // Add some dots if the command allows unlimited arguments
-        if (!commandDescription.hasMaximumArguments()) {
-            sb.append(ChatColor.ITALIC).append(" ...");
-        }
-
         // Return the build command syntax
         return sb.toString();
     }