Fix compilation with Libav10:
* The member r_frame_rate is no longer present in AVStream. The recommended replacement is avg_frame_rate.
* The enums CODEC_ID_MP3 and CODEC_ID_AC3 have been prefixed with AV_.
Replace deprecated Libav function "avcodec_alloc_frame" by the recommended replacement "av_frame_alloc".
Added Vcs-* stanzas to debian/control.

Thanks to "IOhannes m zmölnig" for the review!
Improved readability of "Description" field in debian/control.

Thanks to "IOhannes m zmölnig" for the review!
Remove explicit binary package dependencies that can be calculated by ${shlibs:Depends}.

Thanks to "IOhannes m zmölnig" for the review!
Get rid of unnecessary rules override for correct installation of the upstream changelog. "dh_installchangelogs" handles it fine on its own, if the file doesn't appear in the "docs" file.

Thanks to "IOhannes m zmölnig" for the review!
Fixed issues with copyright file:
* Corrected upstream authors and license
* Moved license texts to the end of the file
* Made "Source" stanze independent of the version

Thanks to "IOhannes m zmölnig" for the review!
Removed changelog entries 1.3-1 -> 1.11-1 because they are not relevant from an external point of view (1.3-1 never made it to debian).

Thanks to "IOhannes m zmölnig" for the review!
Patch the QMake project configuration file to make sure the build/linking flags specified by debian/rules are passed on to QMake.