Allow support for namespaces

[jespa007]

namespace my_namespace{

}

I think is not necessary having static function support. We can organize all source files in the folders and classify each class by naming group at the end (usually). Name/Refactory is immediatly. Namespaces adds a layer of complexity.
The probability of name colliding can be negligible.

Personal notes: I hate namespaces because of naming convention. In c++ class/file is typed as CamelCase and namespaces/file are typed as snake_case. As a result we could see in the same folder a set of files typed ad snake_case and CamelCase. If namespace were not exist it would have a better life.