Changes to "HTML5 game" use case

Hello,

As discussed during the face-to-face meeting, I have amended the prose 
of the "game" use case to include the possibility of a number of 
additional effects such as occlusions and obstructions (clock heard 
through wall), sound cone (snake moving its head) and Doppler effect 
(flies). I tried to stick to actual effect one would often find in 
games, even if I suspect the scenario depicted would make for a fairly 
boring gaming experience…

Updated use case is here:
http://www.w3.org/2011/audio/wiki/Use_Cases_and_Requirements#UC_2:_HTML5_game_with_audio_effects.2C_music

This should satisfy ACTION-20, ACTION-21 and ACTION-22 which I have 
therefore moved to "pending review":
https://www.w3.org/2011/audio/track/actions/pendingreview


Cheers,
-- 
Olivier