* build(cxx): align all builds on a C++14 baseline
CMake, Make, tests, tools, and examples now require C++14 so every supported build path shares the same minimum language level. The compiler checks and user-facing documentation reflect that baseline.
* fix(test): keep cores scoped to the failing test
Clear prior cores before each test binary. A passing death test can leave a core that would otherwise be used to diagnose an unrelated later failure.
* revert src/butil/type_traits.h
darion-yaphet
0313102276