Fix masks behaviour in GUI (#489, #491)

Mikhail Svechnikovrequested to merge
i489 into main
  1. Inverts mask application order. Now masks in top of visible stack have priority.
  2. Restores "Show" state after testing resulting mask
  3. "Show" parameter now enables mask, only those shown masks are applied to detector.
  4. Visual behaviour is changed: hidden masks are completely invisible, masks with inverted value are displayed as "holes".

Resolves #489 (closed). Resolves #491 (closed).

Edited by Mikhail Svechnikov

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