hevc: Support bitstream encapsulated as 14496-15 format.
mov: Support HEVC demuxing.
matroskadec: Support HEVC demuxing.
hevc: Set the maximum num_reorder_pics to AVCodecContext.has_b_frames.

Output frames after the num_reorder_pics so that num_reorder_pics==0
outputs frames immediately.
hevc: Add max_sub_layers to HEVCSPS to simplify setting has_b_frames.
hevc_parser: Set pict_type, key_frame and output_picture_number.
hevc: Search start code in decode_nal_units().

User may cut off a weird position and send a packet from there.
This avoids returning as invalid data immediately.
hevc: Remove disable_au.

This hack is now unneeded.
Add libx265 encoder

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Add raw HEVC muxer

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>