Keep live rec 4

Hi Christian,

Finally i propose one PR including all stuff: 'refactoring_timer' and 'keep_live_rec_4'.

There is lot of news, i let you discover them ;). But one thing start recording a live. This was the improvement. Then you could use mythweb to create some special rules and look at the same time the timer view.

br.

ps: Finally addon can only create few of them but it shows all. Our new schedule manager is able to make single, daily and weekly recording. It would be possible to handle more but i didn't want to twist the capabilities of pvr timer. For special rules schedule manager allow only override or dont record and it takes care not to break.