Implement refresh in regedit, take 2

[Crestez Leonard]

This implements refresh in regedit. It's long, but it works in a lot of
special cases I tried using two regedits.
Second try, without c++ comments.

Changelog:
    Fix bug with renaming a subkey in regedit.
    Implement refresh in regedit.
-- 
Crestez Leonard <cleonard at go.ro>
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