vdr-plugin-ttxtsubs

I added back to the ttxtsubs plugin the old "Workaround for some French chns" menu selection and also a selection to choose alignment of the subtitles (left / center / right).

Some of the French channels broadcast live subtitles the way they add word by word to the subtitle. By selecting the left aligned subtitle one can read it easier. With center aligned subtitle words keep scrolling on the screen such a way that reading is quite impossible!

See the attached patch for changes.