Fix libass ass_read_memory() signature
[Confluence] next/previous didn't work for livetv outside of the fullscreen video window - fixes #15076
[builtins] PlayMedia didn't sort the folder prior to adding to playlist. fixes #15089
AESinkPULSE: Don't alter the samplerate - let PA decide
ActiveAE: scale the volume only if it is > 60.0f dB otherwise set it to zero
Merge pull request #4519 from astiob/ass_read_memory

Fix libass ass_read_memory() signature
Merge pull request #4525 from joethefox/ae_zero_volume

ActiveAE: set the scaled volume to zero if the volume is zero
Merge pull request #4511 from fritsch/pa-sample-48000

AESinkPULSE: Let PA handle whatever samplerate we have
Merge pull request #4520 from ronie/confluence-livetv

[Confluence] next/previous fixes for livetv - fixes #15076
Merge pull request #4521 from jmarshallnz/playmedia_order

[builtins] PlayMedia didn't sort the folder prior to adding to playlist
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
videoplayer: some rework and documentation
renderer: bump buffers to 5
videoplayer: update frametime, it might change due to fps detection
videoplayer: give streams with invalid fps a chance for fps detection
dvdplayer: allow rewinding at end of stream, do a seek after rewind
X11: ditch SDL for video and window events
X11: Add xbmc icon
X11: add SDL joystick until we have a better solution