C++17ification!
- Filesystem interaction now uses std::filesystem::path.
- Usage of const char*, std::string have been changed to
std::string_view where appropriate.
- Usage of printf-style functions changed to use fmt.
- moving next to xex utils
- fixing error cases around icon setting (and allowing reset)
- making C++11
- abstracting a bit so future additions will be easier
- fixing non-xex uses
This avoids having to guess the display window title format
Also manually fixed the linting errors picked out by travis which do not
get picked up using xb format locally
This seems to dramatically improve most games (especially with
--vsync=false), though it may cause swap issues with others.
New code should be easier to port, and enables elemental-forms to be
drawn for any emulator UI.
