Make existing request response types fully public

- For consumers who are creating their own `RequestInvoker` they need to manually construct many of our response types. Therefore, the constructors need to also be puclic.

Author: N. Taylor Mullen

src/JsonRpc/ContentModified.cs

@@ -1,15 +1,15 @@
-using OmniSharp.Extensions.JsonRpc.Server;
+using OmniSharp.Extensions.JsonRpc.Server;
 using OmniSharp.Extensions.JsonRpc.Server.Messages;
 
 namespace OmniSharp.Extensions.JsonRpc
 {
     public class ContentModified : RpcError
     {
-        internal ContentModified(string method) : base(null, method, new ErrorMessage(ErrorCodes.ContentModified, "Content Modified"))
+        public ContentModified(string method) : base(null, method, new ErrorMessage(ErrorCodes.ContentModified, "Content Modified"))
         {
         }
 
-        internal ContentModified(object id, string method) : base(id, method, new ErrorMessage(ErrorCodes.ContentModified, "Content Modified"))
+        public ContentModified(object id, string method) : base(id, method, new ErrorMessage(ErrorCodes.ContentModified, "Content Modified"))
         {
         }
     }

src/JsonRpc/RequestCancelled.cs

@@ -1,15 +1,15 @@
-using OmniSharp.Extensions.JsonRpc.Server;
+using OmniSharp.Extensions.JsonRpc.Server;
 using OmniSharp.Extensions.JsonRpc.Server.Messages;
 
 namespace OmniSharp.Extensions.JsonRpc
 {
     public class RequestCancelled : RpcError
     {
-        internal RequestCancelled(string method) : base(null, method, new ErrorMessage(ErrorCodes.RequestCancelled, "Request Cancelled"))
+        public RequestCancelled(string method) : base(null, method, new ErrorMessage(ErrorCodes.RequestCancelled, "Request Cancelled"))
         {
         }
 
-        internal RequestCancelled(object id, string method) : base(id, method, new ErrorMessage(ErrorCodes.RequestCancelled, "Request Cancelled"))
+        public RequestCancelled(object id, string method) : base(id, method, new ErrorMessage(ErrorCodes.RequestCancelled, "Request Cancelled"))
         {
         }
     }

src/JsonRpc/TimeLoggerExtensions.cs

@@ -5,7 +5,7 @@
 
 namespace OmniSharp.Extensions.JsonRpc
 {
-    internal static class TimeLoggerExtensions
+    public static class TimeLoggerExtensions
     {
         private class Disposable : IDisposable
         {