ConfigureAddonXML: Allow in-tree build as part of XBMC itself
Windows: rename libhts project to prevent a clash with the version from XBMC itself
This change allows for including the "xbmc-pvr-addons" in the "XBMC for Windows" solution.
This allows for easier debugging of pvr addons under Windows
Windows: rename all VS projects for pvr related libraries to "pvrlib.name"
This to prevent a name clash when importing the xbmc-pvr-addons solution in the main XBMC solution
Rename VS project libcmyth to pvrlib.libcmyth to prevent a name clash when including the PVR addons solution in the XBMC solution
windows: copy the pvr addons to the XBMC addons dir if found
Check wether we are building the pvr addons in a subdir below the XBMC source tree and copy the addons to the addons dir