Gaphor

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- Add support for DataType, ValueType, Primitive, and Enumeration
- Model state is stored per model, restores where you left off
- Add support for Containment Relationship
- Focus already opened model when opening a model file
- Remove the New From Template option
- Upgrade toolbox to be compatible with GTK 4
- Add regression tests
- Fix build fails when GitHub Actions secrets are not available
- Fix association direction arrow is not updated

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- Fix issue where ornaments were not show on associations
after loading a model

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- Fix scrollbars cause the diagram to disappear
- Update Italian translation
- Left align the toolbox header labels

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- Add support for C4 model
- Add support for Fault Tree Analysis with RAAML
- Update the UML data model to align closer to version 2.5.1
- Enable arrow keys to expand and collapse namespace tree
- Allow Gaphor profiles to be copy and pasted between models
- Improve diagram drawing and scrolling speed
- Add Croatian translation
- Remove gray borders around editable text
- Complete converting all tests to pytest
- Fix guides are misaligned when top-left handle is moved
- Update development environment instructions
- Fix undo and redo does not set attributes
- Fix selection lasso is in the wrong place after scrolling

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- Fix undo of deleted elements
- Fix requirements are missing ID and text
- Add CSS styling to dropzone and grayed out elements
- Start to remove use of inline styles

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- Fix drawing of composite association