Support async

[fredemmott]

• add a co_await runner to profiles
• support async lambdas and mappers

This is to allow:

• running other stuff in the main profile run loop, e.g. a webserver
• a nicer API for running stuff with a delay - co_await winrt::resume_after(std::chrono::milliseconds(100));

[fredemmott]

• most things (including DirectInput) can boil down to a waitable HANDLE, then WaitForMultipleObjects()
• timers can either be implemented via CreateWaitableTimer() + SetWaitableTimer(), or by keeping track of them and using the timeout for WaitForMultipleObjects()
• if windows are created (eg for a system tray icon), the event loop must run in the thread that owns the window, and use MsgWaitForMultipleObjects()