Fix #183

[matter123]

This adds namespace aliases and moves the namespace name into the namespace head pattern.

Namespace Alias:

this tags namespace name = qualified-namespace ; as meta.declaration.namespace.alias with appropriate scopes for each component.

Namespace blockFinderFor changes:

with namespace aliases, the only meaning on namespace now is the start of a namespace block. This means that the start pattern of the namespace blockfinder for can be simplified to just a bound /namespace/. The tagging of namespaces was moved into the head includes.

@alekseyt this should allow you to target scoped in namespace scoped::namespace {} with meta.head.namespace.cpp entity.name.type.namespace.scope-resolution.cpp

[alekseyt]

Thank you. Can confirm C++17 nested namespaces can now be colored uniformly using meta.head.namespace.cpp to override color of scope-resolution in the beginning (head) of namespace, namespace aliases are highlighted too.

[jeff-hykin]

Well I was just going to add support for localized scope resolution names. I did that, but then the tests were broken for function calls, and then for function definitions. So I updated function calls and definitions (got rid of the legacy versions), then there was a minor problem with templated functions so I tweaked the template_call pattern.

A lot of tag names changed, and in general a lot of core patterns changed so this commit definitely could use your review. Sorry that it's one giant commit.

The change could still use cleaning up, I think there are still some legacy function patterns hanging around.

[jeff-hykin]

One known regression is the type-casting operators are now marked as templated function calls.

[matter123]

Looks Good! Just some naming and styling nitpicks.

[matter123]

One known regression is the type-casting operators are now marked as templated function calls.

I cant repo

[jeff-hykin]

Oh I guess one of the last changes I made fixed the type casting ¯_(ツ)_/¯