freetype: drop CoreText specific Select in favor of the generic implementation and add family lookup

No fallback yet

This removes a Carbon dependency and adds support for tvOS and iOS

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Drops the current long term average to a moving
average/vertical horizontal filter with an
observation window of 250ms.

Decoder still need to be signaled when FIFO is already empty.

This reverts commit 32040fdc.

Since recent changes, DecoderThread need to be signaled only when
frames_countdown is incremented.

Signed-off-by: Thomas Guillem <thomas@gllm.fr>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Once we drop iOS 7, we can also remove the legacy implementation based on UIAlertView

only handling them should differ. adds debugging

And add implicit discontinuity on format change.
Use only tracker events to change state (will need to move currentchunk away)

As mentioned by documentation
"It may be freed and replaced with a new buffer by libavformat."
" AVIOContext.buffer holds the buffer currently in use"