* cmake: use c++17
* Use std::size
* Use std::make_unique
* Use std::clamp
* Use structured binding
* Use [[fallthrough]]
* Use enable_if_t/is_enum_v/is_integral_v/is_same_v
* Use if constexpr
* Use try_emplace
* Use auto for iterators
* Use inline variables
ggpo: support for arcade games using keyboard (totd, luptype) and
mouse/rotary encoders (waiwai drive)
Chat and UI now usable when the keyboard is not set to a maple port.