Integrate execution into Compiler Explorer

[RaduNichita]

[] Add integration with Compiler Explorer (trunk version, automated nigthly clone)

Main issue - bemanproject/beman#110

[dietmarkuehl]

Thanks, Radu! I hope to work on getting execution (as well as net and task) onto compiler explorer over the weekend.

[RaduNichita]

I already started working on task and if I manage to do it, I will mirror the things for net as well.