TSMAPI extension + support for Vanity Item search (#14)

* GetItemPrice TSMAPI-Extension

* Itemfilter Vanity Item Support

* Rarity search extended up to heirloom

* Rarity search extended up to heirloom

TradeSkillMaster_Shopping/modules/Search.lua

@@ -420,7 +420,7 @@ local function GetItemSubClass(str, class)
 end
 
 local function GetItemRarity(str)
-	for i=0, 4 do
+	for i=0, 7 do
 		local text =  _G["ITEM_QUALITY"..i.."_DESC"]
 		if strlower(str) == strlower(text) then
 			return i
@@ -586,4 +586,4 @@ end
 
 function Search:GetCurrentSearchMode()
 	return private.mode
-end
+end