Fixing incorrect task name for TemplateText.

#1
Adding comments to the sample settings.props file indicating which properties will have build templates expanded and what variables are available.

#1
Updating the shared.templatetext script so that it only creates the ItemGroup that contains the replacement tokens.
It is apparently not possible to pass properties between an included task and the owning script. So the owning script will have to sort out the actual replacement action.

#1
Adding build template replacement for all paths where it makes sense.

#1
Updating the nBuildKit settings.props file to match the sample settings.props file.

#1
Merge pull request #1 from pvandervelde/issue/stringtemplates

MsBuild: Allow template replacement in most file and directory values