Optional

[henryiii]

Initial tests for support for Options, and cleanup. Closes #9. Supports std::optional, std::experimental::optional, and boost::optional if your compiler supports __has_include (You can manually add support if __has_include is missing).

Other changes:

• C++ version check now in Macros.hpp, is similar to Pybind11
• Fix for non-cleared stream in some cases
• CLI11_* is used for all macros and CMake variables
• Deprecated macros now work properly
• C++17 testing added
• Rewritten single file generator, much more powerful, with "verbatim" support
• Added informational printout to CTest
• Added support for GTest on MSVC 2017 (but not in C++17 mode, will need GTest 1.8.1 when released)

[codecov]

Codecov Report

Merging #95 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #95   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines        1395   1399    +4     
=====================================
+ Hits         1395   1399    +4

Impacted Files	Coverage Δ
include/CLI/App.hpp	100% <ø> (ø)	⬆️
include/CLI/TypeTools.hpp	100% <100%> (ø)	⬆️
include/CLI/Option.hpp	100% <100%> (ø)	⬆️

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