Fix adding, loading and searching for content in the Watchlist

[ppo]

Currently we can see items on the watchlist screen. Please allow to open the detail view of a title by clicking on it. If technically not possible, at least do a search with that title.

Right now, I've to check my watchlist, remember the title, open the search box, type the title.

[dutchy1001]

There are no movies in my watchlist, just series only. When clicking on 1 and choosing an episode it works. Saying that, there is no art displaying just the PCT logo, but normal view as when you choose from the serie list.

[ppo]

I've to manage my watchlist via Trakt. That screen is definitely far from working fine, and therefore useless in that state.

For me, "favorites" if for my favorite items and "watchlist" for those I plan to see later.
As I was explaining in #1764, it could be easier to manage "flags" per item (seen, favorite, watchlist, trashed…). And there could be a dropdown filter (with an option "not watched")… not good like that, need more thoughts.

[dutchy1001]

I get it now, the wachlist is connected to trakt.tv. It makes a lot more sense now.

So to allow PCT to add to the "watchlist" it needs to be able to update your trakt.tv account with the choices you make from the list in PCT. Adding an extra button isn't difficult (well it is for me 😛), allowing to make changes to trakt.tv will be different job.