Theia: run embedded slapos in a service + bash completions + upate to 1.8.0
Use slapos.core!265 (merged) to run slapos in a controlled services.
Enable bash-completions so that we can benefit from existing completions and generate fish completions using slapos.core!253 (merged)
Apply a workaround for segmentation faults when exiting theia-open
Update to 1.8.0 https://github.com/eclipse-theia/theia/blob/v1.8.0/CHANGELOG.md#v180---26112020