Added a generic symbol for an N- and P-channel MOSFET pair.
Added a TSOP6 footprint based on the data for one of the transistors I have, plus variants of the footprint with renamed pads that can be used with a generic MOSFET symbol (TSOP6_DDGSDD.fp) and with the generic N/P pair (TSOP6_G1S2G2D2S1D1.fp).