episode tracking update

Using script.common.plugin.cache , it creates a table called "WCO" in its default db file commoncache.db and keeps the list of watched episodes in the following format: "episode title , episode page url". I used the episode page url instead of the direct stream url to be able to match links from different hosts under the same episode title.

The stupid interface of GitHub can't even merge this time. It's experimental, needs a bit of testing (particularly for animes with weird names such as .Hack//blahblah due to invalid characters.)