Add more mount paths for the local directory

This adds more mount paths for the XEX's local directory to Emulator::LaunchXexFile, so any XEXs that try to use these mountpoints can load files from the XEX directory.

Mount points added:
- \Device\Harddisk0\Partition0 -  original mountpoint used by Xenia
- \Device\Harddisk0\Partition1 - some games/apps seem to use this to refer to HDD1:
- \Device\Harddisk0\Partition1\DEVKIT
  Used by xshell.xex, gets linked as E: (aka "development drive")
  Even if a DEVKIT folder exists inside the local folder, it seems we still have to add this mount point explicitly.

- \Device\LauncherData
  Also used by xshell.xex for various UI resources
  The xlaunch.fdf file is normally mounted via DmMountFdfxVolume to this path (xlaunch.fdf is a FATX formatted container)
  By mounting this xshell can retrieve extracted resources from the local dir.

- \SystemRoot
  Normally refers to the NAND, used by dash.xex to retrieve XZP resources when they aren't inside xam.xex.
  Other apps also use this to refer to other system XEXs/resources
  By mounting it we can just place any needed resources in the local dir.

src/xenia/emulator.cc

@@ -275,28 +275,38 @@ X_STATUS Emulator::LaunchXexFile(const std::filesystem::path& path,
   // and then get that symlinked to game:\, so
   // -> game:\foo.xex
 
-  auto mount_path = "\\Device\\Harddisk0\\Partition0";
+  // Register local directory as some commonly used mount paths
+  std::filesystem::path mount_paths[] = {
+      "\\Device\\Harddisk0\\Partition0",
+      "\\Device\\Harddisk0\\Partition1",
+      "\\Device\\Harddisk0\\Partition1\\DEVKIT",
+      "\\Device\\LauncherData",
+      "\\SystemRoot",
+  };
 
+  // Todo: is this even remotely correct?
   if (discSwap) {
-    mount_path = "\\Device\\LauncherData";
+    mount_paths[0] = "\\Device\\LauncherData";
   }
 
   // Register the local directory in the virtual filesystem.
   auto parent_path = path.parent_path();
+  for (auto mount_path : mount_paths) {
     auto device =
-      std::make_unique<vfs::HostPathDevice>(mount_path, parent_path, true);
+        std::make_unique<vfs::HostPathDevice>(mount_path.u8string(), parent_path, true);
     if (!device->Initialize()) {
       XELOGE("Unable to scan host path");
       return X_STATUS_NO_SUCH_FILE;
     }
     if (!file_system_->RegisterDevice(std::move(device))) {
-    XELOGE("Unable to register host path");
+      XELOGE("Unable to register host path as {}", mount_path.u8string());
       return X_STATUS_NO_SUCH_FILE;
     }
+  }
 
   // Create symlinks to the device.
-  file_system_->RegisterSymbolicLink("game:", mount_path);
+  file_system_->RegisterSymbolicLink("game:", mount_paths[0].u8string());
-  file_system_->RegisterSymbolicLink("d:", mount_path);
+  file_system_->RegisterSymbolicLink("d:", mount_paths[0].u8string());
 
   // Get just the filename (foo.xex).
   auto file_name = path.filename();