Enable building directly on a mac

Exception of CP.100 refined to include the "sequentially consistent memory model" only

dropping NVI from proto-rules due to no consensus on #768

tools and library rules

Issue #808

Ubuntu dictionaries extracted from:
http://us.archive.ubuntu.com/ubuntu/pool/main/h/hunspell-en-us/hunspell-en-us_20070829-6ubuntu3_all.deb

in philosophy

Add en_US dictionary from https://extensions.libreoffice.org/extensions/english-dictionaries/2017-01.01
rather than relying on system installed ones which may not exist and
point the make logic at that dictionary

Merge branch 'thread-tooling' of https://github.com/tituswinters/CppCoreGuidelines into tituswinters-thread-tooling

C.138 initial content

Added example from the issue

Added an example to SF.7
Clarified SF.6 and SF.7 that "using-directive" means "using namespace"

auto will deduce as unique_ptr<D> and the correct destructor will call. Anyway, this should be a bad example.

I: Enforcement fixes/completion

C.131: getters should be const member functions

C.127 should not claim that there is a defined behavior

Review/Rework of English Language Readability

I: Grammar, spacing and typo fixes

GSL.concept: Dead link fix