Validation Project v2 (#444)

Refactor of the Validation System for more ease of use in the future.
The project now builds a standalone executable and executes it before
the main project is built or published.
Since it is now a standalone executable we are also able to use .NET
Core features as we are no longer locked to netstandard.

The project currently includes 1 task, LocalesValidationTask, that will
check if the locales.json file has any of the following issues:
The json is invalid.
The json has locales with missing languages.
The json has locales with langauges that are just duplicates of the
en_US field.

If the project is built or published locally it will also fix any
missing languages or duplicate fields.

---------

Co-authored-by: Evan Husted <gr33m11@gmail.com>
Co-authored-by: Evan Husted <greem@greemdev.net>

src/Ryujinx.BuildValidationTasks/Ryujinx.BuildValidationTasks.csproj

@@ -1,19 +1,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
-    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
+    <OutputType>Exe</OutputType>
   </PropertyGroup>
 
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Build.Utilities.Core" />
-    <PackageReference Include="Newtonsoft.Json" />
-  </ItemGroup>
+  <Target Name="PostBuildTarget" AfterTargets="AfterBuild">
+    <Message Text="Running Validation Project" Importance="high" />
 
-  <UsingTask TaskName="Ryujinx.BuildValidationTasks.LocaleValidationTask" TaskFactory="TaskHostFactory" AssemblyFile="$(OutDir)Ryujinx.BuildValidationTasks.dll" />
-
-  <Target Name="LocalesJsonValidation" AfterTargets="AfterRebuild">
-    <LocaleValidationTask />
+    <Exec WorkingDirectory="$(ProjectDir)bin\Debug\$(TargetFramework)\"
+      Command="dotnet Ryujinx.BuildValidationTasks.dll &quot;$(ProjectDir)..\..\\&quot;" 
+      ConsoleToMsBuild="true"
+      />
   </Target>
 
-</Project>
+</Project>