Add Spectre.Cli to Spectre.Console

* Renames Spectre.Cli to Spectre.Console.Cli.
* Now uses Verify with Spectre.Console.Cli tests.
* Removes some duplicate definitions.

Closes #168

examples/Console/Progress/DescriptionGenerator.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+
+namespace ProgressExample
+{
+    public static class DescriptionGenerator
+    {
+        private static readonly string[] _verbs = new[] { "Downloading", "Rerouting", "Retriculating", "Collapsing", "Folding", "Solving", "Colliding", "Measuring" };
+        private static readonly string[] _nouns = new[] { "internet", "splines", "space", "capacitators", "quarks", "algorithms", "data structures", "spacetime" };
+
+        private static readonly Random _random;
+        private static readonly HashSet<string> _used;
+
+        static DescriptionGenerator()
+        {
+            _random = new Random(DateTime.Now.Millisecond);
+            _used = new HashSet<string>();
+        }
+
+        public static bool TryGenerate(out string name)
+        {
+            var iterations = 0;
+            while (iterations < 25)
+            {
+                name = Generate();
+                if (!_used.Contains(name))
+                {
+                    _used.Add(name);
+                    return true;
+                }
+
+                iterations++;
+            }
+
+            name = Generate();
+            return false;
+        }
+
+        public static string Generate()
+        {
+            return _verbs[_random.Next(0, _verbs.Length)]
+                + " " + _nouns[_random.Next(0, _nouns.Length)];
+        }
+    }
+}