Convert all projects to use dotnet cli preview4 tools

This change migrates all existing projects over to MSBuild projects
that work with preview4 of the dotnet cli tools.  This allows us to build
our Full- and CoreCLR code with a single set of projects, even our our CI
server.

Author: daviwil

PowerShellEditorServices.Common.props

@@ -0,0 +1,15 @@
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
+  
+  <PropertyGroup>
+    <VersionPrefix>0.9.0</VersionPrefix>
+    <VersionSuffix>beta</VersionSuffix>
+    <Company>Microsoft</Company>
+    <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
+    <PackageTags>PowerShell;editor;development;language;debugging</PackageTags>
+    <PackageLicenseUrl>https://raw.githubusercontent.com/PowerShell/PowerShellEditorServices/master/LICENSE</PackageLicenseUrl>
+    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <RepositoryType>git</RepositoryType>
+    <RepositoryUrl>https://github.com/PowerShell/PowerShellEditorServices</RepositoryUrl>
+  </PropertyGroup>
+</Project>