Refactored menu creation
Stop background process when removing objects from the plater
Rotation around X and Y axes from plater
XYZ mirroring from plater
Show contextual menu when right-clicking on a plater object
Fix regression in cut
Prevent crash when trying to export G-code from menu and there are no objects
Apply transform to meshes before displaying the 3D preview canvas
Fix compilation on 5.18(?)
Add 5.20 to Travis CI builds
Add missing use for dirname.
Add GCode class definition.
Add typemaps.
Remove use of Perl dSP macro in ExtrusionEntity (no longer relevant).
Move Layer::islands() method to C++.
Begin porting GCode object [storage] to C++.
Move GCode's extruders array to C++.