Embed symbols (#3)

* ImplicitUsings -> GlobalUsings (with some additions)

* embed symbols into the DLL

Author: lostmsu

src/ClassLib.csproj

@@ -14,8 +14,7 @@
     <!-- The following is recommended for public projects -->
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <DebugSymbols>true</DebugSymbols>
-    <IncludeSymbols>true</IncludeSymbols>
-    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <DebugType>embedded</DebugType>
   </PropertyGroup>
 
   <ItemGroup>

src/GlobalUsings.cs

@@ -0,0 +1,8 @@
+global using System;
+global using System.Collections.Generic;
+global using System.Linq;
+global using System.Threading;
+global using System.Threading.Tasks;
+
+// for FormattableString.Invariant
+global using static System.FormattableString;