Add mount and umount functions for winfsp implementation.

RomRepoMgr.Core/Filesystem/Winfsp.cs

@@ -1,10 +1,13 @@
 using System;
 using Fsp;
+using Fsp.Interop;
 
 namespace RomRepoMgr.Core.Filesystem
 {
     public class Winfsp : FileSystemBase
     {
+        FileSystemHost _host;
+
         public static bool IsAvailable
         {
             get
@@ -24,5 +27,27 @@ namespace RomRepoMgr.Core.Filesystem
                 }
             }
         }
+
+        internal bool Mount(string mountPoint)
+        {
+            _host = new FileSystemHost(this);
+            int ret = _host.Mount(mountPoint);
+
+            if(ret == STATUS_SUCCESS)
+                return true;
+
+            _host = null;
+
+            return false;
+        }
+
+        internal void Umount() => _host?.Unmount();
+
+        public override int SetVolumeLabel(string VolumeLabel, out VolumeInfo VolumeInfo)
+        {
+            VolumeInfo = default;
+
+            return STATUS_MEDIA_WRITE_PROTECTED;
+        }
     }
 }