Multiple updates

ITV - New ITVPlayer site support. Use Correct file extent .flv. Add subtitle support. Include plugin version.
Channel4 - Correct file extent .flv. Hunt for .mp4 stream, use ps3 mp4 if found as preferred. Include plugin version.
URLFinder - display plugin version if present.
Utils - Add subtitle convert ttml to srt, used by ITV.
get_flash_videos - constants are compile time, not runtime, fix version display.
Makefile.PL - Add required modules.

Note ITV subtitles creates a .ttml file this is to be removed or made optional, present in case of problems with new subtitle code.