regedit: Allows semicolon comments

[Bruno Jesus]

Currently if a line with anything but @ and " is detected in
processRegEntry it closes the regkey and further additions to it are
ignored, so if we have something like the following file regedit will
ignore the next lines until a new regkey is opened.

REGEDIT4
[HKEY_CURRENT_USER\Software\Wine\MenuFiles]
;test
"sample.lnk"="sample.lnk"

So we simply need to interpret these semicolon lines as comments and
safely ignore them.

Fixes bug http://bugs.winehq.org/show_bug.cgi?id=27192
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