Add the template files as links to the ATxService project, pointing to
the central "Solution Items" files and mark them for copying to the
build output location. Update the Make-Package script accordingly.

All projects (and namespaces) should start with an "ATx" prefix, having
a capital "AT" and a lowercase "x".

Currently this is almost entirely untested and configuration for email
notifications is yet to be done.

Refers to #3

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

This removes the XmlWrapper namespace and uses the DLL instead.

Fixes #21

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.

Corresponds to "autotransfer-v1".