Make some hardcoded messages configurable

src/main/java/uk/co/notnull/proxyqueues/queues/ProxyQueueEventHandler.java

···
 import com.velocitypowered.api.proxy.ServerConnection;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import net.kyori.adventure.text.Component;
-import net.kyori.adventure.text.format.NamedTextColor;
 import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+import uk.co.notnull.proxyqueues.Messages;
 import uk.co.notnull.proxyqueues.ProxyQueuesImpl;
 import uk.co.notnull.proxyqueues.api.QueueType;
 import uk.co.notnull.proxyqueues.api.queues.QueuePlayer;
···
                 if(waitingServer.isPresent()) {
                     event.setResult(ServerPreConnectEvent.ServerResult.allowed(waitingServer.get()));
                 } else {
-                    player.disconnect(Component.text(
-                            "This server has queueing enabled and can't be connected to directly. Please connect via playmc.rtgame.co.uk")
-                                              .color(NamedTextColor.RED));
+                    player.disconnect(Messages.getComponent("cannot-connect-directly"));
 
                     return;
                 }

src/main/java/uk/co/notnull/proxyqueues/queues/QueuePlayerImpl.java

···
 package uk.co.notnull.proxyqueues.queues;
 import com.velocitypowered.api.proxy.Player;
 import net.kyori.adventure.bossbar.BossBar;
-import net.kyori.adventure.text.Component;
+import uk.co.notnull.proxyqueues.Messages;
 import uk.co.notnull.proxyqueues.api.QueueType;
 import uk.co.notnull.proxyqueues.api.queues.ProxyQueue;
 import uk.co.notnull.proxyqueues.api.queues.QueuePlayer;
···
         this.lastSeen = null;
         this.queued = Instant.now();
 
-        this.bossBar = BossBar.bossBar(Component.text("Joining queue..."), 0, getBossBarColor(),
+        this.bossBar = BossBar.bossBar(Messages.getComponent("notify.joining"), 0, getBossBarColor(),
                                        BossBar.Overlay.PROGRESS);
         this.player.showBossBar(bossBar);
     }

src/main/resources/messages.yml

···
      <reasons>
   pause-reason: "<gray> - <reason>"
   unpaused: "The queue for <yellow><server><aqua> has resumed"
+  joining: "Joining queue..."
 commands:
   kick-success: "Kicked <yellow><player><aqua> from the <yellow><server><aqua> queue"
   join-success: "You have joined the queue for <yellow><server>"
···
     You need to link your Discord account and have one of the required roles to join this server.
     Please follow the instructions to link your Discord account.
   discord-not-verified: "Your Discord account does not have any of the roles required to join this server."
+  cannot-connect-directly: "<red>This server has queueing enabled and can't be connected to directly. Please connect via playmc.rtgame.co.uk"
 reconnect:
   restore-position: |-
     Seems you lost connection to the server. We have <yellow>restored<aqua> your previous queue position.