[SUGGESTION/RFC] Replace scope resolution operator '::' with member access operator '.'

[mhermier]

Hi,

The idea behind that change is to change/simplify the syntax of how we access namespaces components. If the notion of namespace is shifted a little bit to an instantiated "static sparse struct", then the scope resolution operator '::' can simply be replaced with member access operator '.'.

PROS:

• It unifies the syntax when accessing static/constexpr variables.
• It simplify the teaching of the navigation in the symbol namespace by eliminating the special case of the scope operator.
• It eases moving code from namespace variables to member variables. As such it should also be an opportunity to reduce diffs in scm.
• It should also simplify tools like code generators, by unifying the syntax we don't need a special case for generating namespace member access.

CONS:

• There might be some corner cases when trying to access types, but I'm quite convicted the ease of write surpass the burden of theses corner cases.
• I wonder how error prone the unary left '.' operator can be when accessing the global scope.

For now I don't consider it a complete suggestion, but I wonder what other people think about that idea, hence the RFC.