OkayFreedom

What's new in this version:

- New arrange algorithm.
Shout-out to Prusa Research, since they made the libnest2d library for this, and allowed a licence change.

- When opening a project file, pick any matching printer in addition to just exact match and new definition.
Previously, when someone sent you a project, you either had to have the exact same printer under the exact same name, or create an entirely new instance. Now, in the open project dialog, you can specify any printer that has a(n exactly) matching printer-type.

Fixed:
- Fixed under-simplification (blobs, zits) on some printer models. An oversight in 4.6.x resulted in an oversimplification (smoothing) of models. The attempted fix in 4.7.x overcompensated, which gave difficulty (zits, blobs) for some printer models when the resulting gcode became too intricate. This is now fixed, though some profiles might need to be updated, since they where made against 4.6.x, and therefore may rely on the over-simplification
- Fix percentage text-fields when scaling non-uniformly
- Fix cloud printer stuck in connect/disconnect loop
- Fix rare crash when processing stair stepping in support
- Fix sudden increase in tree support branch diameter
- Fix cases of tree-support resting against vertical wall
- Fix conical support missing on printers with 'origin at center' set
- Fix infill multiplier and connected lines settings not cooperating with each other
- Fixed an issue with skin-edge support, contributed by smartavionic
- Fix printer renaming didn't always stick after restart
- Fix move after retraction not changing speed if it's a factor 60 greater
- Fix Windows file alteration detection (reload file popup message appears again)
- OBJ-file reader now doesn't get confused by legal negative indices
- Fix off-by-one error that could cause horizontal faces to shift one layer upwards
- Fix out of bounds array and lost checks for segments ended with mesh vertices, contributed bt skaraso
- Remove redundant 'successful responses' variable, contributed by aeroto
- In rare cases, brim and prime-tower-bim would overlap
- Fix support for some models when bottom distance and stair step height where both 0 (like with PVA)
- An issue with infill only overlap modifier when the wall line count was overridden in the global settings
- Filling gaps between walls would also fill between skin and infill