Fixed generation of static methods by processing it right in the parser and generator.

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -869,7 +869,8 @@ namespace CppSharp.Generators.CSharp
 
             Write("public ");
 
-            if (method.Kind == CXXMethodKind.Operator)
+            if (method.IsStatic ||
+                method.Kind == CXXMethodKind.Operator)
                 Write("static ");
 
             var functionName = GetFunctionIdentifier(method, @class);

src/Parser/Parser.cpp

@@ -560,6 +560,7 @@ CppSharp::Method^ Parser::WalkMethodCXX(clang::CXXMethodDecl* MD)
     Method->Access = ConvertToAccess(MD->getAccess());
     Method->Kind = GetMethodKindFromDecl(Name);
     Method->OperatorKind = GetOperatorKindFromDecl(Name);
+    Method->IsStatic = MD->isStatic();
 
     WalkFunction(MD, Method);