Added channel connect event

ButtonCore/src/main/java/buttondevteam/lib/TBMCChannelConnectEvent.java

@@ -0,0 +1,59 @@
+package buttondevteam.lib;
+
+import buttondevteam.lib.chat.Channel;
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.command.CommandSender;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+
+import javax.annotation.Nullable;
+
+/**
+ * The purpose of this event is to determine which group the given channel belongs to
+ * or to validate that they have access to the given group chat.<br>
+ * It's mainly meant to be called from DiscordPlugin and listened for in ButtonChat
+ * and the groups are towns/nations.
+ */
+@Getter
+public class TBMCChannelConnectEvent extends TBMCChatEventBase implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
+
+    @Nullable
+    private final CommandSender sender;
+    @Nullable
+    @Setter
+    private String groupid; //Town name etc.
+
+    /**
+     * Using this the group will be determined based on the sender.
+     *
+     * @param sender  The sender to get the group from
+     * @param channel The channel to use
+     */
+    public TBMCChannelConnectEvent(CommandSender sender, Channel channel) {
+        super(channel, "Channel connecting message. One of the things users should never see in action.", -1);
+        this.sender = sender;
+    }
+
+    /**
+     * Using this the given group will be validated and used.
+     *
+     * @param groupid The group to use, for example the name of a town or nation
+     * @param channel The channel to use
+     */
+    public TBMCChannelConnectEvent(String groupid, Channel channel) {
+        super(channel, "Channel connecting message. One of the things users should never see in action.", -1);
+        this.groupid = groupid;
+        this.sender = null;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}