connect start and stop buttons to functions

file output support, currently directories are hard coded.

for youtube it's: $site/$output (youtube.com/filename.mp4)

for everything else it's: $site/$channel/$channel-$output
(twitch.tv/tylersgaming/tylersgaming-1.mp4)

file output checks if the file already exists before it starts to
record, it will alert users if they need to change the output filename