Minor PLC improvements proposal

Deutsch Kroene and Smolensk added to irredentist decision of PLC;
Pomerelia cores added to Deutsch Kroene and Elbing to prevent excessive assimilation of Polish POPs there;
Changed PLC colour to something less hideous;
Fascist PLC now called Sarmatia;
Improvements to PLC political parties;
Kustrin province's bordergore reduced