master
String: Use rapidhash for hashing
LICENSE: Replace references to Copyright.txt with LICENSE.rst
cm::filesystem::path: ensure independence from the program locale.
cm::optional: Suppress GCC -Wmaybe-uninitialized false positive
cmext/algorithm: Fix return type of cm::keys and cm::values
CMake C++11 Compatibility: Add more type_traits from C++14 and C++17