Implements proper save path (#386)

* initial save path implementation

* fix savedatatype offset, remove incomplete createsavedata implimentation

* address nits

* fix crash if npdm is not found

* made saveinfo readonly, other stuff

* remove context param from saveinfo contructor

* fix style

* remove whitespace

Ryujinx.HLE/FileSystem/SaveDataType.cs

@@ -0,0 +1,12 @@
+namespace Ryujinx.HLE.FileSystem
+{
+    enum SaveDataType : byte
+    {
+        SystemSaveData,
+        SaveData,
+        BcatDeliveryCacheStorage,
+        DeviceSaveData,
+        TemporaryStorage,
+        CacheStorage
+    }
+}