TinyMessenger: Parameterize sender type in ITinyMessage and descendant classes

[MhmmdAb]

I'm working on a project where I'm finding myself repeatedly downcasting the Sender property in ITinyMessage and co to more concrete types to access their properties. So I thought it would be nice to have variants of ITinyMessage, TinyMessageBase, and GenericTinyMessage that take the sender type as a generic type parameter.

Here's an example of what it could look like using sender of type Foo, receiver of type Bar, and message of type FooHitTheBarMessage:

public class Foo
{
    public float Speed { get; private set; }

    //
    // Omitted details
    //
}

public class FooHitTheBarMessage : TinyMessageBase<Foo>
{
    public FooHitTheBarMessage(Foo sender)
        : base(sender)
    {   
    }
}

public class Bar
{
    public void Init()
    {
        MessageBus.Subscribe<FooHitTheBarMessage>(msg =>
        {
            TallyDamageBasedOnHitSpeed(msg.Sender.Speed);
        });
    }

    //
    // Omitted details
    //
}