Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/FSO.Server.Api.Core/Utils/ApiMail.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net.Mail;
+
+namespace FSO.Server.Api.Core.Utils
+{
+    /// <summary>
+    /// Used to mail our users.
+    /// Could be more useful in the future when out of Beta.
+    /// </summary>
+    public class ApiMail
+    {
+        string subject;
+        string template;
+        Dictionary<string, string> strings;
+
+        public ApiMail(string template)
+        {
+            this.template = template;
+            this.strings = new Dictionary<string, string>();
+        }
+
+        public void AddString(string key, string value)
+        {
+            strings.Add(key, value);
+        }
+
+        private string ComposeBody(Dictionary<string, string> strings)
+        {
+            string baseTemplate = File.ReadAllText("./MailTemplates/MailBase.html");
+            string content = File.ReadAllText("./MailTemplates/" + template + ".html");
+
+            foreach (KeyValuePair<string, string> entry in strings)
+            {
+                content = content.Replace("%" + entry.Key + "%", entry.Value);
+            }
+
+            strings = new Dictionary<string, string>();
+            return baseTemplate.Replace("%content%", content);
+        }
+
+        public bool Send(string to, string subject)
+        {
+            Api api = Api.INSTANCE;
+
+            if(api.Config.SmtpEnabled)
+            {
+                try
+                {
+                    MailMessage message = new MailMessage();
+                    message.From = new MailAddress(api.Config.SmtpUser, "FreeSO Staff");
+                    message.To.Add(to);
+                    message.Subject = subject;
+                    message.IsBodyHtml = true;
+                    message.Body = ComposeBody(strings);
+
+                    SmtpClient client = new SmtpClient();
+                    client.UseDefaultCredentials = true;
+
+                    client.Host = api.Config.SmtpHost;
+                    client.Port = api.Config.SmtpPort;
+                    client.EnableSsl = true;
+                    client.Credentials = new System.Net.NetworkCredential(api.Config.SmtpUser, api.Config.SmtpPassword); 
+
+                    // Send async
+                    client.SendMailAsync(message);
+
+                    return true;
+                } catch(Exception e) {
+                    return false;
+                }  
+            }
+            return false;
+        }
+    }
+}