This branch is an attempt to add x265 (HEVC) support to avidemux.

In order to accomplish this, I am working on the following tasks:
* Porting the x264 plugin and GUI to support x265 (20% done)
* Migrating avidemux to ffmpeg 1.x to 2.x for x265 support (20% done)

Note that this solution does not currently build,
as I am working to resolve some issues with VDPAU.

The avidemux_core project; however, will build and can be considered a milestone.