Exec: option to hide process window

[bent-rasmussen]

Typing code is sometimes interrupted when windows are opened so that new literals can be established for Exec. To avoid this, it would be helpful if there was an option for Exec to not show a process window.

[Tarmil]

Good call, I think this should even be the default.

[bent-rasmussen]

I found it hard to work with this feature turned on all the time, so I used this simple workaround: conditional compilation directives to distinguish between development builds and production builds; use default values for development builds (#if ... #else ...).