Internalizes the WcWidth package

This way, there is no need to download the WcWidth package,
and it also becomes easier to debug issues related to
Unicode cell widths.

src/Spectre.Console/Spectre.Console.csproj

@@ -4,10 +4,10 @@
     <TargetFrameworks>net5.0;netstandard2.0</TargetFrameworks>
     <Nullable>enable</Nullable>
     <IsPackable>true</IsPackable>
+    <NoWarn>SA1633</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Wcwidth" Version="0.2.0" />
     <PackageReference Include="System.Memory" Version="4.5.0" Condition="'$(TargetFramework)' == 'netstandard2.0'" />
   </ItemGroup>
 
@@ -26,6 +26,9 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Wcwidth.Sources" Version="0.6.0">
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
   </ItemGroup>
 
   <PropertyGroup>
@@ -33,4 +36,20 @@
     <GenerateNullableAttributes>False</GenerateNullableAttributes>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net5.0|AnyCPU'">
+    <DefineConstants>$(DefineConstants)TRACE;WCWIDTH_VISIBILITY_INTERNAL</DefineConstants>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net5.0|AnyCPU'">
+    <DefineConstants>$(DefineConstants)TRACE;WCWIDTH_VISIBILITY_INTERNAL</DefineConstants>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|netstandard2.0|AnyCPU'">
+    <DefineConstants>$(DefineConstants)TRACE;WCWIDTH_VISIBILITY_INTERNAL</DefineConstants>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netstandard2.0|AnyCPU'">
+    <DefineConstants>$(DefineConstants)TRACE;WCWIDTH_VISIBILITY_INTERNAL</DefineConstants>
+  </PropertyGroup>
+
 </Project>