Type handling is mainly done using templates.
Template Slic3r::ClassTraits is used to store info about exported types (perl class name). Currently only perl class name and refference name is used.
Template values are initialized by REGISTER_CLASS macro. This macro is used in .cpp file of class ( it needs to be used exactly for each type).
Ref<type> class is used to return value as perl reference. Operator overloading is used to make c++ and XSpp happy, only pointer value should be possible to return.
Clone<type> class is used to return copy of value ( using new and copy constructor). Copy is created on assigment, this should be probably improved (memory leak on multiple assignments).
It is overloaded to be able to return type, type* and type&.
Typechecking in ExtrusionEntityCollection updated to check all passed types.
Test line direction is changed to reflect 0=east angle system
Test patern rotation direction is reversed - $angle represents infill direction
Angle test is changed to avoid returning negative value (this does happen otherwise - adding increments to $angle
creates ~ 1e-15 rounding error)
This adds --sudo flag to Build.PL. This flag is passed to cpanm,
so it is possible to build Slicer on linux without beeing root (build files
are owned by user)
Petr Ledvina