Testing package creation with MSBuild
and MSBuild.Community.Tasks - just to understand how it works. 
When complete, it will replace Package.cmd script and remove 7zip dependency,
(though adding MSBuild.Community.Tasks dependency)
More tweaks to .targets file
Added Packages project
to make install and source DNN packages. 
Install and source targets moved to separate packages.
SqlDataProvider and manifest files moved to Packages project.
Merge pull request #25 from roman-yagodin/msbuild-1

Use MSBuild scripts to make install and source packages instead of Package.cmd