Marked old PoolMetaData constructor obsolete
Marked old PoolMetaData constructor obsolete

robinryf/Entitas-CSharp,robinryf/Entitas-CSharp,vkuskov/Entitas-CSharp,sschmid/Entitas-CSharp,sschmid/Entitas-CSharp,vkuskov/Entitas-CSharp