Release share v0.50.1 (2023-11-05)

This release bring many enhancements to "lib/memfs", a library for
caching
file system in memory.

===  Enhancements

* lib/memfs: return nil in AddChild if file not exist
* lib/memfs: quote the path in the returned error
* lib/memfs: add method Child to Node
* lib/memfs: call the Init method in the embedded file
* lib/memfs: include empty directory
* lib/memfs: re-scan directory content on Node’s Update
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