Add AnsiConsole.Write method

This commit also obsoletes the `AnsiConsole.Render` method.

Closes #576

examples/Console/Emojis/Program.cs

@@ -14,7 +14,7 @@ namespace Spectre.Console.Examples
 
         private static void RenderEmoji()
         {
-            AnsiConsole.Render(
+            AnsiConsole.Write(
                 new Panel("[yellow]Hello :globe_showing_europe_africa:![/]")
                     .RoundedBorder());
         }