[android] Add Android TV support

Add Android TV support. This simply means adding an entry to the TV
launcher.

Tested on ADT-1 Android TV device.

Video playback seems to work fine, audio playbacks work with stereo
PCM and basic passthrough. A separate commit adds 5.1 PCM support.

There are two significant issues that I saw:
- crash on exit, looks like double free at /system/lib/libmedia.so
  (android::sp<android::AudioTrackClientProxy>::~sp()+10),
  maybe something to do with threading? or just an Android bug...
- a warning flood on playback of many videos:
  W/art: Attempt to remove local handle scope entry from IRT, ignoring

Both of these look like either general issues introduced with Android L
and/or ART, not Android TV specific issues (but I did not confirm that).
[android] Declare touchscreen as unneeded

We do not require touchscreen (though we can use it). Declare it as not
required in the manifest (it defaults to required as per documentation).

This is mostly cosmetic at this point, since it mostly affects Play
Store filtering, but it does not hurt to have the manifest correct.
[libs] Remove superfluous freetype version/project from the tree.
[android] Add 5.1 PCM playback support

Tested on ADT-1 Android TV device.

This commits add code for supporting arbitrary channel layouts with the
AudioTrack API. However, at least on ADT-1 any non-5.1 layout gets
downmixed to 2.0, so add a compile-time define for limiting playback to
2.0 and 5.1 (so that e.g. 4.0/5.0 content is played back as 5.1), at
least for now (i.e. until a device with support for non-2.0 non-5.1
appears).
Merge pull request #5187 from ace20022/remove_freetype

[libs] Remove superfluous freetype version/project from the tree.
Merge pull request #5082 from anssih/android/pcm5.1

[android] Add 5.1 PCM playback support
Merge pull request #5083 from anssih/android/tv

[android] Initial Android TV support
[dbwrappers] have query() take a std::string, we copy direct into a std::string anyway in the functions
[smartplaylist] adds routine for generating queries against videodb link tables
[videodb] add routines for creating link indices
[videodb] refactors UpdateActorLinkTable into UpdateActorLinksToItem, AddActorLinksToItem, with special case for musicvideos
[videodb] switch actor table and links to the new layout
[videodb] cleanup AddCast, AddLinkToActor to drop unused params
[videodb] refactor UpdateLinkTable into AddLinksToItem, UpdateLinksToItem, and use these when adding genre,country,studio
[videodb] switch the studio,genre,country and link tables to the new format
[videodb] switch the tag and link tables to the new layout
[videodb] simplify AddToLinkTable, RemoveFromLinkTable implementations
[videodb] adds AppendFilter() to simplify repetitive queries in GetFilter
[videodb] FIX: drop incorrect querying of non-existent setlinkmovie table
[videodb] use type_view for views