Update dialog_base implementation, assets and documentation

tests/NumericCaptureAction.cs

@@ -0,0 +1,11 @@
+namespace Cthangover.Mods.Dialog.Tests
+{
+    using Cthangover.Core.Actions;
+    internal class NumericCaptureAction : IScenarioAction
+    {
+        public string Name=>"dsl_test.capture";
+        public string Amount {get;private set;}
+        public string Item {get;private set;}
+        public void Run(IActionContext context){Amount=context.GetParam("count");Item=context.GetParam("id");}
+    }
+}