rename class and sources GUI/View/Setup/MaskEditorPropertyPanel -> GUI/View/Setup/MaskEditorToolpanel

Merging branch '838a'  into 'main'.

See merge request !2150

[m.i790] Add button for updating start values when previous fitting cycle is done (#790) (Closes #790)

Merging branch 'm.i790'  into 'main'.

See merge request !2149

Merging branch 'm.i837'  into 'main'.

See merge request !2147

Merging branch 'm.i836'  into 'main'.

See merge request !2146