Alpha implementation of dependency property source generator.

Testing project for source generator

WpfExtended.SourceGeneration.Tests/Class1.cs

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+using System.Windows.Controls;
+using System.Windows.Extensions;
+
+namespace WpfExtended.SourceGeneration.Tests
+{
+    public partial class Class1 : UserControl
+    {
+        [GenerateDependencyProperty]
+        public int someF;
+    }
+}

WpfExtended.SourceGeneration.Tests/Launcher.cs

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+namespace WpfExtended.SourceGeneration.Tests
+{
+    public class Launcher
+    {
+        public static int Main()
+        {
+            return 0;
+        }
+    }
+}

WpfExtended.SourceGeneration.Tests/WpfExtended.SourceGeneration.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <LangVersion>preview</LangVersion>
+    <OutputType>Exe</OutputType>
+    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
+    <CompilerGeneratedFilesOutputPath>obj</CompilerGeneratedFilesOutputPath>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\WpfExtended.SourceGeneration\WpfExtended.SourceGeneration.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+  </ItemGroup>
+
+</Project>