PlotModel: changed DefaultColors from List to IList
PlotModel: changed DefaultColors from List to IList

H2ONaCl/oxyplot,br111an/oxyplot,Rustemt/oxyplot,Jofta/oxyplot,sevoku/oxyplot,Kaplas80/oxyplot,bbqchickenrobot/oxyplot,jeremyiverson/oxyplot,olegtarasov/oxyplot,oxyplot/oxyplot,TheAlmightyBob/oxyplot,as-zhuravlev/oxyplot_wpf_fork,svendu/oxyplot,jeremyiverson/oxyplot,Kaplas80/oxyplot,DotNetDoctor/oxyplot,objorke/oxyplot,br111an/oxyplot,NilesDavis/oxyplot,Isolocis/oxyplot,bbqchickenrobot/oxyplot,bbqchickenrobot/oxyplot,shoelzer/oxyplot,HermanEldering/oxyplot,lynxkor/oxyplot,GeertvanHorrik/oxyplot,HermanEldering/oxyplot,freudenthal/oxyplot,as-zhuravlev/oxyplot_wpf_fork,objorke/oxyplot,br111an/oxyplot,Sbosanquet/oxyplot,olegtarasov/oxyplot,GeertvanHorrik/oxyplot,sevoku/oxyplot,Sbosanquet/oxyplot,DotNetDoctor/oxyplot,Rustemt/oxyplot,zur003/oxyplot,jeremyiverson/oxyplot,shoelzer/oxyplot,lynxkor/oxyplot,mattleibow/oxyplot,Mitch-Connor/oxyplot,ze-pequeno/oxyplot,Sbosanquet/oxyplot,Mitch-Connor/oxyplot,H2ONaCl/oxyplot,mattleibow/oxyplot,freudenthal/oxyplot,as-zhuravlev/oxyplot_wpf_fork,svendu/oxyplot,Jonarw/oxyplot,shoelzer/oxyplot,GeertvanHorrik/oxyplot,objorke/oxyplot,BRER-TECH/oxyplot,BRER-TECH/oxyplot,H2ONaCl/oxyplot,Rustemt/oxyplot,Mitch-Connor/oxyplot,lynxkor/oxyplot,TheAlmightyBob/oxyplot,TheAlmightyBob/oxyplot,freudenthal/oxyplot,svendu/oxyplot