Remove old apps. Remove unused extensions. Add format checker extensions and flylint settings to workspace. Add multigpu build to all-apps.

Add new flag: BUILD_VF_ALL_SAMPLES (default = off). Is set to true in CI. When BUILD_VF_ALL_SAMPLES is true more apps are added to the project.

NOTE: currently not working!

the version in develop was missing brackets

update ALM app

Added SG model to StressBC, added Timer-class which wraps existing timer in Simulation, added round-off correction in TurbulentViscosityCumulantK17CompChim_Device (testing ongoing)