Change the subsystem of a PE executable between console and windows applications.
chsub is available in the haxelib repository and can be installed with haxelib install chsub.
haxelib run chsub [windows|console] EXE_FILE
So to change a console application to a windows application:
$ haxelib run chsub windows ./path/to/app.exe
And then to reverse the changes:
$ haxelib run chsub console ./path/to/app.exe