CEF C++ wrapper requires C++17 features starting with M105

[Marshall Greenblatt]

The CEF C++ wrapper (libcef_dll_wrapper) and related CEF header files will require C++17 features starting with current master and the M105 release branch. This impacts C++ users only as the CEF C API remains unchanged.

The minimum client build toolchain versions for C++ remain unchanged. Build configurations will need to be updated as follows:

• Build with -std=c++17 instead of  -std=c++14 on MacOS and Linux.
• Build with /std:c++17 instead of the default /std:c++14 on Windows.

See issue #3362 for complete details.