Workaround to fix segfault with a C++ deleted widget

Closes #2826

See merge request bliss/bliss!3801

Flint: Remove scan simulator from Flint

Closes #2773

See merge request bliss/bliss!3800

Use scroll bar for the measurement group menu

Closes #2803

See merge request bliss/bliss!3799

ScansWatcher: Reorder the branches to only check 'channel' and 'lima' nodes

Closes #2824

See merge request bliss/bliss!3797

scan_info: Plot description for curves

See merge request bliss/bliss!3790

Flint: Display curves from many scans

Closes #1936

See merge request bliss/bliss!3771