Add rpm folder to pgdbsc csproj.
Move version numbers from version.xml to .targets files.

Remove need to parse XML file in build step.
Add msdbsc.targets to msdbsc.csproj so it shows in VS.
Fix build of pgdbsc.Integration.
Rework installer build process.

Build installers using the .wixproj projects now instead
of the .csproj projects.
Fix wrong project .targets file imported.