New firewire device module

This is a new device module (firewire2) for firewire cameras that I've created with the help of Ruben Gonzales (thank you very much). With this module you can re-encode the dv video and audio with Galicaster on the fly. I've used the firewireavi device module as a prototype for the new one. 

You can configure the videoencoder by setting the values for the parameter "videoencoder" 
(i.e. videoencoder = x264enc bitrate=6000 interlaced=true speed-preset=2) and the audioencoder 
by setting the values for the parameter "audioencoder" (i.e. audioencoder = lamemp3enc bitrate=192 target=1 cbr=true). In addition you can set a capsfilter (i.e. caps = video/x-raw-yuv, width=720, height=576, framerate=25/1) and you can choose a muxer (i.e. muxer = mp4mux)