Since we have more to share between the applications than just the XML
wrappers, this is the location to keep common classes and methods.

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Try to read the config and status files from there and show a balloon
tip message if that fails before exiting the app.

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This removes the XmlWrapper namespace and uses the DLL instead.

Fixes #21

Fixes #22

Note that this only adds the new class library, it does not yet adjust
the existing service code to use it!

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An email will be sent only if the time since the last one exceeds the
new configuration option "GraceNotificationDelta", defaulting to 12
hours.

Fixes #1

Make GraceLocationSummary() return an empty string instead, if no
expired folders exist in the grace location.

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Plus also check if the repository's commit state is dirty and report
accordingly.

This is done using a git-hook script generating a text file which is
used as a resource by VS. The pre-build script in VS makes sure the file
is actually existing (using a default string) since otherwise the build
would fail.

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