Added SSL for MySQL connections.
GUIRadioButton: add separate textures for radio image for focus/unfocus states
Use album artist fanart when there is no artist fanart

This is useful especially for albums that are by one main artist but
have some songs featuring other artists, so there may be fanart for "A"
but not "A feat. B".
[language] add string locations
added: setting to disable keyboard grabbing when in fullscreen on platforms that use SDL on X11, calls SDL_WM_GrabInput(SDL_GRAB_OFF) with the SDL_FULLSCREEN temporarily zero'd, this will make SDL call XUnGrabPointer and XUnGrabKeyboard, allowing window manager keys like printscreen, volume and alt-tab to work
changed: Don't allow change of volume amplification with passthrough audio
smartplaylists: use simple WHERE conditions instead of expensive IN statements
smartplaylists: cosmetics in SQL queries
smartplaylists: use SELECT DISTINCT in SQL sub-queries
smartplaylists: replace SQL IN with SQL EXISTS in WHERE conditions
sync to current internal FFMpeg code
Speedup for opening music song library

Previously, this repeatedly parsed the same URL string over and over again
for every song, each time the list of songs was opened.

Benchmarks for CMusicDatabase::GetSongsByWhere() on a Raspberry Pi with a
library of 4115 songs:

Before patch: 14.5 seconds
After patch:   4.0 seconds
fixed, video playback glitches for avcC content
1) update internal ABI headers
2) removed aml legacey vars and structs
3) add debug filedump of data sent to amcodec.so
4) remove internal avCC convert, CBitStreamConverter handles it.
   this was cause of glitch, a rare double convert attempt that
   resulted a malformed NAL which faulted the hw decoder.
[configure] enable TLS support in ffmpeg via gnutls
[depends] add gnutls
try to fix gmp compilation on android
only set gmp ABI on 32bit linux
[WIN32] added gnutls 3.2.3 to our mingw environment and the runtime dlls to system/players/dvdplayer
[WIN32] added: build ffmpeg with gnutls support. Force extracting during unzipping.
[depends] - for darwin add xz as dependency for allowing extraction of tar.xz files