- update to 21.06:
* Synthesize Technic Pneumatic Tubes
* Added option to choose the axis icon location.
* Added LeoCAD to the Linux Snap Store.
* Added preview indicator for synth parts.
* Fixed crash loading certain parts.
* Fixed moving pieces while editing submodels in place.
* Fixed loading primitives from ldrawunf.zip.
* Made library installation optional in the Windows installer.
* Highlight missing parts in the timeline.
* Add Unhide selected menu item
- drop patches that are upstream:
0001-Don-t-enable-relative-transforms-by-default.patch
0002-Disabled-relative-movement-when-moving-pieces-withou.patch
0003-Fixed-moving-pieces-while-editing-submodels-in-place.patch
0004-Fixed-drawing-the-rotate-overlay-during-in-place-sub.patch