totem-ui: first of all, build the ui, then...

first of all, build the ui, then populate it with grilo resolve
operation
Remove Guest Actors for now
fix: fill vertically and horizontally
remove css + add content-grid
insert GtkScrolledWindow on content-grid
no shadow on GtkScrolledWindow
fix gcc warnings
Request Movies metadata to tmdb

1-) We use local-metadata to fill basic metadata from filename.
2-) If the media is a TV Show, we use the tvdb source; If the media is a
movie, we use the tmdb source;
3-) Build basic UI from those requests;
fix: gbl_num_tests check into new util function
some comments and moving code around
a few fixes for movies in the UI
poster-img: showname for tvshows, title for movies