Camera support (net-daemon#57)

Add Camera support to Fluent API.

In the effort to get more specific support for enitity domains in the fluent api, the camera is now added. Also it is first of many refactorings of the fluent API to make it simpler and easier to maintain.

The autogenerated camera entities will now use this interface instead.

Sample below:

```csharp
await DefaultDaemonHost
         .Camera("camera.camera1")
         .Snapshot("/config/www/snapshots/cam1.jpg")
         .ExecuteAsync();
```

.vscode/daemon.code-snippets

@@ -46,4 +46,18 @@
             ],
             "description": "XUNIT fact"
         },
+        "fluentinterface": {
+            "scope": "csharp",
+            "prefix": "fluenti",
+            "body": [
+                "   /// <summary>",
+                "   ///     Generic interface for $1",
+                "   /// </summary>",
+                "   public interface I$1<T>",
+                "   {",
+                "       T $1($2);",
+                "   }",
+            ],
+            "description": "Fluent interface"
+        },
     }

exampleapps/apps/theapp.cs

@@ -31,8 +31,11 @@ public static string PrettyPrintDictData(IDictionary<string, object>? dict)
     }
     public override async Task InitializeAsync()
     {
-        Log("SET TESTSENSOR");
-        await SetState("sensor.testsensor", "10");
+        // await Camera("camera.my_camera")
+        //     .Snapshot("/config/www/motion/snap.jpg")
+        //     .ExecuteAsync();
+        // Log("SET TESTSENSOR");
+        // await SetState("sensor.testsensor", "10");
 
         // await CallService("light", "toggle", new { entity_id = "light.tomas_rum" }, false);