Added D2PAK/TO-263 fp. Tweaked TVS diagram, SMC fp.

D2PAK is used for very large (high current) MOSFETs. SMC fp was made
smaller to match recommended fps. Tweaked TVS is for ESD and AC
kickback. Some TVS components are uni-directional so the schematic
component was edited to have the standard Anode/Cathode pad names.