GitInfo does not work when the project does not compile any source file

Assume no compilation is involved in a project, this is the case for example in .nuproj projets.
When the project references the GitInfo nuget package, the targets (`GitInfo`, `GetVersion`, etc.) are not executed. However, it would be nice to also access git information properties in .nuproj files that only contain metadata such as targets files and do not produce any assembly.

Git information retrieval currently only occurs only when compilation occurs, as
shown in the lines below extracted from `GitInfo.targets`
```

GitInfo;
GitVersion;
GitThisAssembly;
GitInfoReport;
$(CoreCompileDependsOn)

```

The property above could be changed into something like `CoreBuildDependsOn`.

Or is there any specific reason for using `CoreCompileDependsOn`?

Start in GitInfo.targets and trace the GitInfo, GitVersion, GitThisAssembly, and GitInfoReport targets under CoreCompileDependsOn. Verify behavior with a .nuproj project that has no source compilation; done means the Git information properties are available there as well.

Written by the indexing model from the issue text.