hwaccel

[gerwin3]

To-do

• review changes
• update README.md
• go through all new
• test for memory leaks
• test master branch downstream
  • engine
    • decoding
    • encoding
    • forwarding
    • double-check frame rate detection
  • alarm manager
  • oddity-rtsp
  • other projects?
• bump version

Changelog

• added hardware acceleration support for Decoder
• added DecoderBuilder API
• added EncoderBuilder API
• added ReaderBuilder, WriterBuilder, BufWriterBuilder and PacketizedBufWriterBuilder
• added MuxerBuilder and RtpMuxerBuilder
• removed support for ffmpeg version 3.4 up to and including 4.2
• removed Locator API in favor of Location API with better ergonomics
• some to changes to function names in video_rs::encode::Settings
• EncoderSettings is no longer exported directly (video_rs::encode::Settings)
• ... reorgnized the entire crate so many top-level imports are now only part of their respective submodule