Fixed Guild Alliances + minor Guild rework

All Guild Alliances system is now functional. Tweaked guilds in order to
sync MapleGuildCharacter objects that were supposed to be the same when
being accessed from both MapleGuild and MapleCharacter classes.

src/net/server/world/World.java

@@ -196,7 +196,7 @@ public class World {
     public MapleGuild getGuild(MapleGuildCharacter mgc) {
         int gid = mgc.getGuildId();
         MapleGuild g;
-        g = Server.getInstance().getGuild(gid, mgc.getWorld(), mgc);
+        g = Server.getInstance().getGuild(gid, mgc.getWorld(), mgc.getCharacter());
         if (gsStore.get(gid) == null) {
             gsStore.put(gid, new MapleGuildSummary(g));
         }