Merge branch 'feature/SourceLink' into develop

Introduced Microsoft `SourceLink`, along with recommended configuration settings. Alongside the symbols package, this will help ensure that consumers of the NuGet packages will be able to step into OnTopic code during debugging by associating it with specific commits of specific files on GitHub.

While I was at it, I also migrated from the deprecated `GitVersionTask` to `GitVersion.MsBuild`. This maintains feature parity, while giving us access to new builds going forward. I also reverted the previous update to the `GitVersion.yml`, which didn't behave as intended.

Together, these improve our build process.

Author: JeremyCaney

GitVersion.yml

@@ -3,7 +3,5 @@ mode: ContinuousDeployment
 branches:
   master:
     mode: ContinuousDelivery
-  release:
-    mode: ContinuousDelivery
 ignore:
   sha: []

OnTopic.Data.Transfer/OnTopic.Data.Transfer.csproj

@@ -17,6 +17,9 @@
     <Copyright>©2021 Ignia, LLC</Copyright>
     <OutputPath>bin\$(Configuration)\</OutputPath>
     <Authors>Ignia</Authors>
+    <NeutralLanguage>en</NeutralLanguage>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <IncludeSymbols>true</IncludeSymbols>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -29,8 +32,16 @@
     <NoWarn>1701;1702;CA2227</NoWarn>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(TF_BUILD)' == 'true'">
+    <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
+  </PropertyGroup>
+
   <ItemGroup>
-    <PackageReference Include="GitVersionTask" Version="5.5.1">
+    <PackageReference Include="GitVersion.MsBuild" Version="5.6.6">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>