NextTool queue processing

[mvallevand]

I have updated NextTool with a mechanism that allows you to queue post and parallel processing until later, typically after the EPG update to reduce the impact  on the server during prime recording time.  Example and usage are explained on the wiki. https://github.com/sub3/NextPVR/wiki/NextTool  If you have any usage questions let me know.

I personally use it to defer the creation of thumbs and comskip until overnight since I rarely watch recordings the same day.  User with a fast enough CPU probably won't need this but I have found it very handy so far.

Martin