Added support for Unicode when marshalling strings.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -133,7 +133,7 @@ namespace CppSharp.Generators.CSharp
 
             if (CSharpTypePrinter.IsConstCharString(pointer))
             {
-                Context.Return.Write("Marshal.PtrToStringAnsi({0})",
+                Context.Return.Write("Marshal.PtrToStringUni({0})",
                     Context.ReturnVarName);
                 return true;
             }
@@ -359,7 +359,7 @@ namespace CppSharp.Generators.CSharp
                 type.IsPrimitiveType(PrimitiveType.WideChar)) &&
                 pointer.QualifiedPointee.Qualifiers.IsConst)
             {
-                Context.Return.Write("Marshal.StringToHGlobalAnsi({0})",
+                Context.Return.Write("Marshal.StringToHGlobalUni({0})",
                     Helpers.SafeIdentifier(Context.Parameter.Name));
                 CSharpContext.Cleanup.WriteLine("Marshal.FreeHGlobal({0});",
                     Helpers.SafeIdentifier(Context.ArgName));

tests/Basic/Basic.Tests.cs

@@ -1,4 +1,4 @@
-using System.Reflection;
+using System.Reflection;
 using NUnit.Framework;
 using Basic;
 
@@ -103,5 +103,14 @@ public class BasicTests
         Assert.That(typeof(Foo2).GetProperty("P",
             BindingFlags.Instance | BindingFlags.NonPublic), Is.Not.Null);
     }
+
+    [Test]
+    public void TestUnicode()
+    {
+        Foo foo = new Foo();
+        const string georgia = "საქართველო";
+        foo.Unicode = georgia;
+        Assert.That(foo.Unicode, Is.EqualTo(georgia));
+    }
 }
  

tests/Basic/Basic.h

@@ -11,6 +11,8 @@ public:
     Foo();
     int A;
     float B;
+
+    const char* Unicode;
 };
 
 class DLL_API Foo2 : public Foo