Unit handling in layer oriented sample editor

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requested review from @t.knopff

assigned to @t.knopff

changed title from Unit handling to Unit handling in layer oriented sample editor

added 4 commits

• c487d08f - add abstract base class for SelectionDescriptors to ease referencing
• d52dec0e - use AbstractSelectionDescriptor
• 40a062d3 - refactor for later undo/redo
• 7d3922d8 - assure edits/labels on added forms show correct units

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approved this merge request

added 1 commit

• 6e73b049 - use platform independent UTF-8 coding

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resolved all threads

added 18 commits

• 6e73b049...ae7af93b - 9 commits from branch develop
• 2f7ee5d5 - add settings for default unit (angstrom/nanometer)
• 96488416 - improve unit switching (two auto-exclusive actions)
• ef30a15c - add icons for units (angstrom, nm)
• 95885831 - use unit icons in actions of layer oriented sample editor
• 79f102ba - add abstract base class for SelectionDescriptors to ease referencing
• a12705d2 - use AbstractSelectionDescriptor
• f697bb8c - refactor for later undo/redo
• f69c2224 - assure edits/labels on added forms show correct units
• 9cdcb043 - use platform independent UTF-8 coding

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enabled an automatic merge when the pipeline for 9cdcb043 succeeds

merged

mentioned in commit 6aa82dfe