Make it possible to compile commands/plugins with more modern C# features in some cases on Windows

Does require Visual Studio to be installed

Author: UnknownShadow200

MCGalaxy/Modules/Compiling/CompilerBackends.cs

@@ -193,6 +193,8 @@ protected override string GetExecutable() {
             string root = RuntimeEnvironment.GetRuntimeDirectory();
 
             string[] paths = new string[] {
+                // Modern Visual Studio compilers
+                @"C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\Roslyn\csc.exe",
                 // First try new C# compiler
                 Path.Combine(root, "csc.exe"),
                 // Then fallback to old Mono C# compiler