feat!: support only .NET Framework 4.7.2

In order to conform with the plugin format and the workflow, the .csproj
file was moved up a level to the root of the `src` folder and the
solution file was renamed.

Workflows were also changed to match the plugin workflows.

BREAKING CHANGE: Supports ONLY .NET Framework 4.7.2

src/Web/RequestHandlers/DefaultRequestHandler.cs

@@ -0,0 +1,17 @@
+using Crestron.SimplSharp.WebScripting;
+
+namespace PepperDash.Core.Web.RequestHandlers
+{
+	/// <summary>
+	/// Web API default request handler
+	/// </summary>
+	public class DefaultRequestHandler : WebApiBaseRequestHandler
+	{
+		/// <summary>
+		/// Constructor
+		/// </summary>
+		public DefaultRequestHandler()
+			: base(true)
+		{ }
+	}
+}