move the containerchan files to a dedicated directory so that we can preserve history

Conflicts:
	containerchan/collapse.gif
	containerchan/expandvideo.js
	containerchan/matroska-elements.txt
	containerchan/matroska.php
	containerchan/player.php
	containerchan/playersettings.js
	containerchan/playerstyle.css
	containerchan/post_reply.html
	containerchan/post_thread.html
	containerchan/posthandler.php
	containerchan/settings.js
	containerchan/video.png
	containerchan/videodata.php
	post_reply.html
	post_thread.html
	templates/post_reply.html
	templates/post_thread.html