Made generated field names unique by appending an instance number if necessary.

Also added the following usages to the Digitizer Page (0x000D) to support Multi-touch displays:

0x000E Configuration,CA,
0x0023 Device Settings,CL,
0x0051 Contact Identifier,DV,
0x0052 Device Mode,DV,
0x0053 Device Identifier,SVDV,
0x0054 Contact Count,DV,
0x0055 Contact Count Maximum,DV,
Added the following usages to the Digitizer Page (0x000D):

0x0047 Confidence,DV,
0x0048 Width,DV,
0x0049 Height,DV,