* Implement android AMediaCodec AVC/VPX codec.
* - Change "anmed" to "and_media" prefix for clearity.
- Check if encoder/decoder exists before enabling codec.
* Fix bug on enum info.
* Add support to AMRNB and AMRWB audio codec.
* Modification based on comments.
* - move VPX packetizer from codec implementation.
* - Remove unwanted changes.
- Fix bug on vpx (VP9) packetize method.
* - New method to initialize vpx packetizer config.
- Don't use pt as codec id.
* add compiler option to prioritze using software or hardware codec.
* add documentation related to packetization mode for H264.
* fix some potential compile error.
* Specify video codec PT to support #2656.
- Add vpx.h/vpx.c to Visual Studio project files
- Fix compile error/warning from Visual Studio
git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@6147 74dad513-b988-da41-8d7b-12977e46ad98