Support ad hoc function and type submodule declarations

[lerno]

Possible syntax

module std::foo;
// Creates a sub module std::foo::bar in which hello() is placed.
fn void bar::hello() 
{
  ...
}

[Caleb-o]

Assuming this only allows a single level of depth? So you can do bar::hello() but maybe not bar::baz::hello()?

[lerno]

Exactly, it will be limited to single level for readability and also implementation should be more straightforward.