Account for folders in copy and move.

Copy and move will use mkdir() if target
is a folder, and copyFile() if target is a file.

Move will recursively copy contents if moving
between different storages. Move will also
change the storageId.

Bug: 67028892
Test: Copy and move folders on win 10
Change-Id: If114ef74b9d8668cf66d45953d9ea8b17bc11ae8