alternative models to replace some of the default models

#3 Missile - Potsmoke
#15 IP Shuttle Potsmoke
#23, #024, #025 Eagle LRF, MK II, MK III - Potsmoke
#26 Sidewinder - Potsmoke
#29 Adder - Potsmoke
#33 Merlin - Potsmoke
#34 Viper MKII (Viper-X) Potsmoke
#39 Constrictor Potsmoke
#56, 215 Imperial Courier- Imperial Trader - Potsmoke
#196 ECM - potsmoke
#197 Naval ECM - potsmoke
#198 Scanner - potsmoke