Due to new amazing features, like string_view in C++ 17 I've decided replace existing String-based implementations to use string and string_view. This should generally improve performance and be more C++ friendly.

This is breaking change, projects should replace String& with std::string& or std::string_view& respectively. Python configuration script for platformio has been updated to automatically enable new standards.

Requirements for bare Arduino users:

• -std=gnu++17
• -std=c++17

Required disabled flags:

• -fno-rtti
• -std=gnu++11