ThisAssembly.Constants NuGet Package

This package generates a static `ThisAssembly.Constants` class with public
constants for each Constant MSBuild item in the project.

For example:

<ItemGroup>
<Constant Include="Foo.Bar" Value="Baz" />
</ItemGroup>

Results in a corresponding `ThisAssembly.Constants.Foo.Bar` constant with the value `Baz`:

Generated code:
C#:

partial class ThisAssembly
{
public static partial class Constants
{
public static partial class Foo
{
public const string Bar = "Baz";
}
}
}.