* 1. Remove all global include_directories.
* 2. Move 3d party dependencies from src to budled deps if possible.
* Unify and enforce one way of including headers:
e.g. #include "libslic3r/GCode.hpp" vs #include "GCode.hpp"
(always use the "libslic3r/GCode.hpp" option).
* Make all dependencies (also header only) a cmake target.
Toolchages (wipe tower/no wipe tower) are always kept and if there are
any toolchanges, the objects are split at the begining of each instance,
while the first travel is always part of the "next" instance.
* Fixes SPE-2116. The reason for this bug was forgotten change in
WipeTowerIntegration after change in gcode.cpp.
* Prevents future similar bugs by unifing the functionality to a method.
During layer change, instead of generating the gcode, generate a placeholder tag. Then at the end of layer processing replace this tag with a ramping travel move.
This solves the issue, that one does not know the starting point of the current layer where the layer change gcode would be originally generate.
The ramping layer changes uses smoothing of the ramping travel. Also it is adjusted in such a way that it increases the ramp angle when the travel is too short, to always reach the next layer.
Wipe tower with "no_sparse_layers" enabled was completely broken.
This commit introduces necessary changes to WipeTowerIntegration.cpp
for it to work properly.
The new travel has an initial flat part, sloped part and
once the travel height reaches maxima a flat part again.
Also, the notion of extruder lift is removed. It is used no more.
Consequently the retract_lift parameter lost its original meaning.
WIP GCode/SmoothPath.cpp,hpp cache for interpolating extrusion path with arches.
Removed Perl test t/geometry.t, replaced with C++ tests.
Refactored ExtrusionEntity and derived classes to hold extrusion attributes in new ExtrusionFlow/ExtrusionAttributes classes.
Reworked path ordering in G-code export to never copy polylines, but to work with a new "flipped" attribute.
Reworked G-code export to interpolate extrusion paths with smooth paths and to extrude those smooth paths.
New parameters: arc_fitting, arc_fitting_tolerance
Renamed GCode class to GCodeGenerator
Moved GCodeWriter.cpp/hpp to GCode/
Moved Wipe from from GCode.cpp,hpp to GCode/Wipe.cpp,hpp
Moved WipeTowerIntegration from GCode.cpp,hpp to GCode/WipeTowerIntegration.cpp,hpp
New variant of douglas_peucker() to simplify range of iterators in place.
Refactored wipe in general and wipe on perimeters / hiding seams.
WIP: Convert estimate_speed_from_extrusion_quality() and its application to smooth paths.
WIP: Cooling buffer to process G2G3, disable arc fitting for filters that cannot process it.
