Add NoteService to handle note operations

NoteService should be the only class with access to NoteDao;
nowhere else should NoteDao be accessed directly.

Channel dependencies are static in PacketProcessor, for now.
Ideally they would be injected in the constructor,
but since the constructor is private and I don't want to open
up that can of worms, I'll leave it like this.
At the very least, now we have a way of injecting services into
the handlers. This will make further restructuring way easier.

src/main/java/net/server/guild/Guild.java

@@ -25,7 +25,7 @@ import client.Character;
 import client.Client;
 import config.YamlConfig;
 import database.DaoException;
-import database.NoteDao;
+import database.note.NoteDao;
 import model.Note;
 import net.packet.Packet;
 import net.server.PlayerStorage;