move card storage/web server handlers to separate files

AMNet.Server/Config.cs

@@ -0,0 +1,31 @@
+using System;
+using Windows.Win32;
+using Windows.Win32.Foundation;
+
+namespace AMNet.Server;
+
+internal static class Config
+{
+    private const string ConfigFileName = @".\segatools.ini";
+
+    internal const string IOSection = "aimeio";
+
+    static Config()
+    {
+        GameId = ReadKey(IOSection, "gameId", 4);
+        ServerName = ReadKey(IOSection, "serverName", 26, Environment.MachineName);
+    }
+    
+    public static string GameId { get; }
+    public static string ServerName { get; }
+    
+    internal static unsafe string ReadKey(string section, string key, uint maxLength, string @default = null)
+    {
+        var buffer = stackalloc char[(int)maxLength + 1];
+        var bufferStr = new PWSTR(buffer);
+
+        PInvoke.GetPrivateProfileString(section, key, @default ?? string.Empty, bufferStr, maxLength, ConfigFileName);
+
+        return bufferStr.ToString();
+    }
+}