Implement -onkeydown and -onmousedown options for ffplay.

Patch by Alexei Svitkine cout << name << "." << surname << "@" << "gmail.com".

See thread:
Subject: [FFmpeg-devel] new command-line option for ffplay
Date: Wed, 23 Jun 2010 09:13:50 -0400

Originally committed as revision 24037 to svn://svn.ffmpeg.org/ffmpeg/trunk