Beta release 0.1.2

Fixed: C# code runner unable to run static void Main() { Console.WriteLine(123); } and similar code.
Changed: open file icon.

Note: the file requires .NET Framework 4.6.1 AND a .NET 4.x Framework Developer Pack to run properly.

P.S. The binary is compiled with AppVeyor. It should be safe to ignore the SmartScreen Filter warning, but please do virus scans as usual because there is no guarantee that AppVeyor is not infected.