Refactor|FS|libcore: Added FileIndex as a separate class
The index of files was previously an internal part of FileSystem,however now it is a class of its own to facilitate observable andcustom indices.
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Refactor|FS|libcore: Added FileIndex as a separate class
The index of files was previously an internal part of FileSystem,
however now it is a class of its own to facilitate observable and
custom indices.