Adds a 'libvpx' target used to build the (soon to be added) jnvpx library. Reverts the instruction for building the jnffmpeg library, since libvpx won't have to be compiled into it anymore.

Fixes an issue of overlapping videos which could cause the local video in a call to be displayed bellow the remote video. Works on remedying issues with telephony conferences utilizing the Jitsi VideoBridge server-side technology.

Adds support to encode and decode VP8. Note that a vp8 encoder and decoder need to be build into the jnffmpeg library in order for this to work, and prebuild binaries aren't ready yet.

Commits the C source code of a refining of the automatic audio device selection to pick up devices from the same hardware.

Activates microphone sensibility modification via Windows CoreAudio (adds 32bits version only for Vista/7/8).

Work in progress using Windows CoreAudio API to set the input device volume (hardware microphone sensibility).

Commits the C source code of a fix of a memory corruption in the FFmpeg JNI library caused by the use of strdup instead of av_strdup.

Improves device selection via portaudio for MacOSX (hostapi coreaudio): adds the possibility to get the device transport type (USB, bluetooth, etc.) and an unique identifier. Corrects problems when: loading the same device twice (for the moment only for the same hostapi), a new plugged device is selected during a call or if the selected device is unchanged.