Added tree variables to THcHallCSpectrometer

Added tree variables to the Hall A "tr" branch.

"tr.GoodPlane4", "Flag for track hitting hodo plane 4",
"tr.GoodPlane3", "Flag for track hitting hodo plane 3",
"tr.fptime", "Track hodo focal plane time",
"tr.npmt", "Track number of hodo PMTs hit",