* add windows latest and gcc 8 builds to azure
* try adding pr trigger
* try adding something specific for gcc 8
* use interface instead of public
* try C++17 on clang 8
* update the readme with some additional notes about gcc 8
* fix some incorrect doxygen comment formatting
* try using the glibcxx_release value
* debug some code paths to make sure macros are working
* Update readme and fix formatting.
* update formatting for Validators
* Add whitespace/comments check
* Adapt spacing in clang-format
* Fix cpplint whitespace/comments issues
* Grammar
* Do not use clang-format for comment spacing
* Fix with clang-format pre-commit hook
fix incorrect parenthesis
update some clang-tidy fixes mainly else after return but a few conversions from into to bool
add extra newline before footer
add an extra field to the extra Error
add a footer callback for help operations
* Adding first draft of Sets
Use IsMember now
Using IsMember as backend for Set
Non-const validator backend
Move set tests to set
Clearer inits
* Drop shortcut
Tighten up classes a bit for MSVC
Check with GCC 4.8 too
* Simpler templates, but more of them
Dropping more type safety for older compilers
Shortcut string set
* Adding shortcut init
Making g++ 4.7 docker image happy
Fix Clang tidy issue with last commit
Adding one more shortcut, adding a couple of tests
* Dropping dual pointer versions of code
* Smarter shortcut syntax
* Adding slighly faster choices
* Cleanup to make InMember simpler
* Drop choices for now, adding some tests
* ValidationError is now always the error from a validator
* Support for other types of initializer lists, including enums
* Factor out type utilities, single version of IsMember code
* Adding a few tests for #224
* Minor cleanup for Validation Error
* Adding tests, moved deprecated tests
* Docs updates
