Peter M. Groen / CLI11

* First streaming version

* Using to_string instead

* Switching to new backend

* Moving to capture function for defaults

* Rename capture_default + _str

* defaultval -> default_str, added always_capture_default

* Fix style

* Adding tests and docs to readme

* Dropping macOS on Travis (supported through Azure)

* 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