Add new function for getting "new" titles

[Electronic-Mango]

Query GetNewTitles should return list of "new" titles.
Structure can, probably, be reused from search and popular.

popularTitles has parameter sortBy (set here to POPULAR) which could probably be modified to something like RELEASE_YEAR. In general it allows for other values:

• POPULAR - used here
• TRENDING
• IMDB_SCORE
• TMDB_POPULARITY
• RELEASE_YEAR - could be used for "new", just with correct sortOrder
• ALPHABETICAL

[Electronic-Mango]

Both options have issues:

• sortBy in popularTitles would also return titles not yet released and, in general, it sorts by actual release date, not by offers date
• GetNewTitles is kinda weird, I'm not sure how exactly it does its sorting and what exactly is sorted

I guess it's also a question of what new would return - last released, last new offers, etc. and whether it would even fit this library.