Reviewed some npcs, added Isle of Solitude as a town

• Reviewed some NPCs looktype & colors (applied to Chemar, Gewen, Grizzly Adams and Uzon)
• Fix on NPC Xelvar (now he sells teleport crystal for 150gp)
• NPC Nurik removed from his spawn (Nurik's script doesn't exists yet. I will re-add the npc when someone add his script) (solved the error related to him in console)
• Added Isle of Solitude as a town, cheers @pitis91 

changes based on:
http://tibia.wikia.com/wiki/Chemar
http://tibia.wikia.com/wiki/Gewen
http://tibia.wikia.com/wiki/Grizzly_Adams
http://tibia.wikia.com/wiki/Uzon
http://www.tibiawiki.com.br/wiki/Xelvar
#1162
http://tibia.wikia.com/wiki/Isle_of_Solitude
http://www.tibia.com/community/?subtopic=character&name=Guido