add optional file hot reloading

[muhopensores]

No description provided.

[cursey]

Thanks for the PR. This is something I've thought about adding in the past but never got around to so I appreciate you implementing this.

The only issue I have is that you've used tabs instead of spaces. If you have clang format installed you can run format.ps1 to fix this, or you can manually convert the tabs into 4 spaces.

[muhopensores]

oops my bad. ran clang format