Fix automated workflow to adjust version numbers

[FroggieFrog]

Currently the build script, the UpdateHelper and propably a dozen other places only support a version with the format major.minor.
The currently released version is determinied by the version.txt file.
This should be fixed and a format of major.minor.build.revision should be supported.

Maybe it would also be nice if the revision part is incremented automatically by the build script.
Maybe this tool can be used: Nerdbank.GitVersioning