[pvr] Gotham - Pickup latest gotham backports/bugfixes to PVR addons

This PR is to generate discussion about updating the PVR addons in Gotham 13.2 Beta builds to pull in the backports/bugfixes that have occured since the last inclusion.  Hopefully if people agreed it could be done, then the PR is here ready to go :)

The last PVR addon inclusion in XBMC was the 26 April and is actually based on the pvr-addons tag gotham_rc1 (which is actually a couple of commits prior to the Gotham 13.0 tag in PVR repo).

All outstanding gotham PR's in pvr repo have now been merged, and since XBMC Gotham 13.2 beta releases are still occuring it seems like it could be a good time to do this?  personally speaking for the pvr.wmc addon, the version included in XBMC Gotham is 2.93 but we are up to 2.99 now.  We encounter quite a few users on the forum who are running the "out of box" old addon version and thus are missing several fixes and features.  I assume alot of the other PVR addons are in the same boat to varying degrees.

By my reckoning, approximately 10 PVR commits will be pulled into XBMC with this change, changing the following addons:
pvr.wmc pvr.nextpvr, pvr.mediaportal, pvr.dvblink, pvr.argustv, pvr.dvbviewer, pvr.vdr.vnsi