Merge 0.8-dev to master

[soininen]

Re spine-tools/Spine-Toolbox#2692

Checklist before merging

• [x] Unit tests pass

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.92308% with 465 lines in your changes are missing coverage. Please review.

Project coverage is 61.74%. Comparing base (bfa32cc) to head (fd60fd6). Report is 1 commits behind head on master.

:exclamation: Current head fd60fd6 differs from pull request most recent head f6062b4. Consider uploading reports for the commit f6062b4 to get more accurate results

Files	Patch %	Lines
...ine_items/importer/widgets/import_editor_window.py	41.11%	49 Missing and 4 partials :warning:
spine_items/exporter/commands.py	22.58%	48 Missing :warning:
...e_items/tool/widgets/tool_spec_optional_widgets.py	73.05%	41 Missing and 4 partials :warning:
spine_items/commands.py	12.50%	35 Missing :warning:
...ms/exporter/widgets/specification_editor_window.py	60.00%	27 Missing and 7 partials :warning:
spine_items/tool/commands.py	28.94%	27 Missing :warning:
spine_items/tool/tool.py	57.57%	12 Missing and 2 partials :warning:
spine_items/importer/widgets/import_sources.py	50.00%	11 Missing and 2 partials :warning:
spine_items/tool/tool_specifications.py	61.76%	13 Missing :warning:
spine_items/tool/executable_item.py	20.00%	12 Missing :warning:
... and 40 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #205 +/- ## ========================================== + Coverage 54.91% 61.74% +6.82% ========================================== Files 192 190 -2 Lines 17440 17687 +247 Branches 2872 2897 +25 ========================================== + Hits 9578 10920 +1342 + Misses 7364 6183 -1181 - Partials 498 584 +86 ```

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[soininen]

Unit tests pass. Yay!