Quick command implementation (#472)

* Separating "SSH Info" and "Quick Launch", and updating translations.

* Adding "Quick Launch" to menu.

* Auto-complete, initial version.

* Builds, but not finished.

* Improved, but there are still some bugs...

* Minor changes.

* Refactroing request/response identifiers.

* Improving command history.

* Minor refactoring.

* Deleting history by using "Del" key.

* Handling mosh special case in quick commands.

* SSH command handled as any other command in the path.

* New resource strings.

* Fixing quick command links.

* Fixing after-merging bugs.

* Improving filtering.

* Finishing filtering.

* Changing placeholder text.

* Minor refactoring.

* Updating resources.

* Renaming NewRemoteTab back to NewSshTab.

FluentTerminal.Models/StringExtensions.cs

@@ -1,12 +1,35 @@
-namespace FluentTerminal.Models
+using System;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+
+namespace FluentTerminal.Models
 {
     public static class StringExtensions
     {
+        private static readonly Regex RxNonWhiteSpace = new Regex(@"\S+", RegexOptions.Compiled);
+
         /// <summary>
         /// Compares two strings for equality, but assumes that null string is equal to an empty string.
         /// </summary>
-        public static bool NullableEqualTo(this string original, string other) => string.IsNullOrEmpty(original)
+        public static bool NullableEqualTo(this string original, string other,
+            StringComparison stringComparison = StringComparison.Ordinal) => string.IsNullOrEmpty(original)
             ? string.IsNullOrEmpty(other)
-            : original.Equals(other);
+            : original.Equals(other, stringComparison);
+
+        /// <summary>
+        /// Splits input text into words, by splitting at white-space characters. It doesn't take care about quotes.
+        /// </summary>
+        public static IEnumerable<string> SplitWords(this string text)
+        {
+            if (string.IsNullOrWhiteSpace(text))
+            {
+                yield break;
+            }
+
+            foreach (Match match in RxNonWhiteSpace.Matches(text.Trim()))
+            {
+                yield return match.Value;
+            }
+        }
     }
 }