feat: clickable URLs in chat log

Adds a parsing step when constructing `Message` objects that scans the
message content for anything that looks URL-like, and inserts new
`TextChunk`s into the message content with a URIPayload set.

Hovering over a URL shows an on-hover effect. Clicking a URL opens it in
the default browser. Right clicking shows the hostname, with an option
to open and an option to copy the URL to the clipboard.

ChatTwo/Resources/Language.Designer.cs

@@ -1040,6 +1040,24 @@ namespace ChatTwo.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Copy link to clipboard.
+        /// </summary>
+        internal static string Context_CopyLink {
+            get {
+                return ResourceManager.GetString("Context_CopyLink", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Copied link to clipboard.
+        /// </summary>
+        internal static string Context_CopyLinkNotification {
+            get {
+                return ResourceManager.GetString("Context_CopyLinkNotification", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Hide chat.
         /// </summary>
@@ -1121,6 +1139,24 @@ namespace ChatTwo.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Open link in browser.
+        /// </summary>
+        internal static string Context_OpenInBrowser {
+            get {
+                return ResourceManager.GetString("Context_OpenInBrowser", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Failed to open the link in the browser, please report this issue.
+        /// </summary>
+        internal static string Context_OpenInBrowserError {
+            get {
+                return ResourceManager.GetString("Context_OpenInBrowserError", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Promote.
         /// </summary>
@@ -1202,6 +1238,24 @@ namespace ChatTwo.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to URL at {0}.
+        /// </summary>
+        internal static string Context_URLDomain {
+            get {
+                return ResourceManager.GetString("Context_URLDomain", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Only open URLs from websites you trust.
+        /// </summary>
+        internal static string Context_URLWarning {
+            get {
+                return ResourceManager.GetString("Context_URLWarning", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Chinese (full).
         /// </summary>