How to gracefully terminate an asynchttpserver with Ctrl-C?

[xflywind]

I think you can't use closure function. Instead you should use global variables.

<https://github.com/planety/prologue/blob/d588f926ae0d103978aecb6038b1c92f2d4659a6/src/prologue/core/application.nim#L67>

<https://github.com/planety/prologue/blob/d588f926ae0d103978aecb6038b1c92f2d4659a6/src/prologue/core/application.nim#L355>