Drop 16.04 CI images & add 20.04 CI dev images
This MR
- removes 16.04 CI and CI Dev images
- adds 20.04 CI Dev images
Reason: CI 16.04 fail to build and Ubuntu Touch 16.04 is EoL anyway.
Edited by Jonatan Hatakeyama Zeidler
This MR
Reason: CI 16.04 fail to build and Ubuntu Touch 16.04 is EoL anyway.