add scheduled playout rebuild (#376)

* configure scheduled playout rebuild

* implement scheduled playout rebuild

* remove variable

ErsatzTV.Application/Playouts/Commands/UpdatePlayout.cs

@@ -0,0 +1,10 @@
+using System;
+using ErsatzTV.Core;
+using LanguageExt;
+using MediatR;
+
+namespace ErsatzTV.Application.Playouts.Commands
+{
+    public record UpdatePlayout
+        (int PlayoutId, Option<TimeSpan> DailyRebuildTime) : IRequest<Either<BaseError, PlayoutNameViewModel>>;
+}