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.

src/Spectre.Console/Extensions/Obsolete/ObsoleteHasCultureExtensions.cs

@@ -0,0 +1,80 @@
+using System;
+using System.ComponentModel;
+using System.Globalization;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="IHasCulture"/>.
+    /// </summary>
+    public static class ObsoleteHasCultureExtensions
+    {
+        /// <summary>
+        /// Sets the culture.
+        /// </summary>
+        /// <typeparam name="T">An object type with a culture.</typeparam>
+        /// <param name="obj">The object to set the culture for.</param>
+        /// <param name="culture">The culture to set.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        [Obsolete("Use Culture(..) instead.")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static T SetCulture<T>(this T obj, CultureInfo culture)
+            where T : class, IHasCulture
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            if (culture is null)
+            {
+                throw new ArgumentNullException(nameof(culture));
+            }
+
+            obj.Culture = culture;
+            return obj;
+        }
+
+        /// <summary>
+        /// Sets the culture.
+        /// </summary>
+        /// <typeparam name="T">An object type with a culture.</typeparam>
+        /// <param name="obj">The object to set the culture for.</param>
+        /// <param name="name">The culture to set.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        [Obsolete("Use Culture(..) instead.")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static T SetCulture<T>(this T obj, string name)
+            where T : class, IHasCulture
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            obj.Culture = CultureInfo.GetCultureInfo(name);
+            return obj;
+        }
+
+        /// <summary>
+        /// Sets the culture.
+        /// </summary>
+        /// <typeparam name="T">An object type with a culture.</typeparam>
+        /// <param name="obj">The object to set the culture for.</param>
+        /// <param name="name">The culture to set.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        [Obsolete("Use Culture(..) instead.")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static T SetCulture<T>(this T obj, int name)
+            where T : class, IHasCulture
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            obj.Culture = CultureInfo.GetCultureInfo(name);
+            return obj;
+        }
+    }
+}