[Feature Request] Solution Import Sharing

[jwyza-pi]

Add ability to import shared sections. Similar to what you can do with csproj files:

<Project Sdk="Microsoft.NET.Sdk.Web">
    <Import Project="../../buildFiles/NonTest.Build.props" />
    <!-- Rest of project files -->
</Project>

something like:

<Solution>
    <Import Solution="../../buildFiles/baseSolution.slnx" />
    <!-- Rest of Solution -->
</Solution>

where ../../buildFiles/baseSolution.slnx might be:

<Solution>
  <Configurations>
    <Platform Name="Any CPU" />
    <Platform Name="x64" />
    <Platform Name="x86" />
  </Configurations>
  <Folder Name="MySharedStuff">
    <File Path="../.editorconfig" />
  </Folder>
</Solution>

[thompson-tomo]

This would be a nice way to implementing a consistent solution filter file definition where only the projects in the launched slnx file are loaded.