Update from upstream (#12)

* Implement GradientUtils (1083)

* Reduce number of created attributes (1084)

* Fix SVG.changed emitted twice (1086)

* Optimize attributes (1087)

* Small bugfix (1088)

* Implement tabs (1091)

* Implement Show in File Manager option (1093)

* Fix View in List capitalization

* Update translations README.md

* Implement Save As (1101)

* Fix some bugs (1104)

* Keep reference of unsnapped camera position (1105)

* Improve Line to Polyline conversion (1106)

* Fix some bugs (1107)

* Fix unimplemented shortcuts (1108)

* Fix About image load warning (1109)

* Various improvements (1110)

* Fix bounding box drawing issue (1111)

* Fix export formatter not working for attributes (1112)

* Update README.md

---------

Co-authored-by: Mew Pur Pur <[email protected]>

Author: syntaxerror247

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