Remove verbs from extension methods

Removed the verbs from all extension methods that manipulate
properties which makes the API more succinct and easier to read.

Also added implicit conversion from string to Style.

As a good OSS citizen, I've obsoleted the old methods with
a warning for now, so this shouldn't break anyone using
the old methods.

examples/Rules/Program.cs

@@ -7,21 +7,33 @@ namespace EmojiExample
         public static void Main(string[] args)
         {
             // No title
-            Render(new Rule().SetStyle("yellow"));
+            WrapInPanel(
+                new Rule()
+                    .RuleStyle(Style.Parse("yellow"))
+                    .LeftAligned());
 
             // Left aligned title
-            Render(new Rule("[white]Left aligned[/]").LeftAligned().SetStyle("red"));
+            WrapInPanel(
+                new Rule("[white]Left aligned[/]")
+                    .RuleStyle(Style.Parse("red"))
+                    .LeftAligned());
 
             // Centered title
-            Render(new Rule("[silver]Centered[/]").Centered().SetStyle("green"));
+            WrapInPanel(
+                new Rule("[silver]Centered[/]")
+                    .RuleStyle(Style.Parse("green"))
+                    .Centered());
 
             // Right aligned title
-            Render(new Rule("[grey]Right aligned[/]").RightAligned().SetStyle("blue"));
+            WrapInPanel(
+                new Rule("[grey]Right aligned[/]")
+                    .RuleStyle(Style.Parse("blue"))
+                    .RightAligned());
         }
 
-        private static void Render(Rule rule)
+        private static void WrapInPanel(Rule rule)
         {
-            AnsiConsole.Render(new Panel(rule).Expand().SetBorderStyle(Style.Parse("grey")));
+            AnsiConsole.Render(new Panel(rule).Expand().BorderStyle(Style.Parse("grey")));
             AnsiConsole.WriteLine();
         }
     }