Moved the changing of access modifiers of constructors of abstract classes to the pass for internal implementations of abstract classes.

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

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -1486,8 +1486,7 @@ namespace CppSharp.Generators.CSharp
             switch (GetValidMethodAccess(method, @class))
             {
                 case AccessSpecifier.Public:
-                    Write(Driver.Options.GenerateAbstractImpls && @class.IsAbstract
+                    Write("public ");
-                        && method.IsConstructor ? "protected " : "public ");
                     break;
                 case AccessSpecifier.Protected:
                     Write("protected ");
@@ -1583,8 +1582,7 @@ namespace CppSharp.Generators.CSharp
             switch (method.Access)
             {
                 case AccessSpecifier.Public:
-                    return @class.IsAbstract && method.IsConstructor ?
+                    return AccessSpecifier.Public;
-                        AccessSpecifier.Protected : AccessSpecifier.Public;
                 default:
                     return method.IsOverride ?
                         @class.GetRootBaseMethod(method).Access : method.Access;

src/Generator/Passes/GenerateAbstractImplementationsPass.cs

@@ -34,7 +34,13 @@ namespace CppSharp.Passes
                 return false;
 
             if (@class.IsAbstract)
+            {
+                foreach (var ctor in from ctor in @class.Constructors
+                                     where ctor.Access == AccessSpecifier.Public
+                                     select ctor)
+                    ctor.Access = AccessSpecifier.Protected;
                 internalImpls.Add(AddInternalImplementation(@class));
+            }
             return base.VisitClassDecl(@class);
         }