Added shrines (#31)

* Added shrines, i think

* Fixed shrines

* Fix for actually determining a shrine the correct way

* Updated to use a Shrine object instead of a boring ID

* After deliberation, removed extra position thingamajigger

pkg/memory/game_reader.go

@@ -1,9 +1,10 @@
 package memory
 
 import (
+	"math"
+
 	"github.com/hectorgimenez/d2go/pkg/data"
 	"github.com/hectorgimenez/d2go/pkg/data/stat"
-	"math"
 )
 
 type GameReader struct {