Porting of Pressure Equalizer feature from Prusa Slicer 2.6.x (#2161)

* Overhang perimeter handling

Updated code to handle overhang perimeters as an overhang and not as a bridge.

* Preparing to add curled extrusions identification

* Porting curling calculations from Prusa Slier 2.6.1

* Prototype 1 - slowdown extended to detect curled edges and further reduce speed

First prototype of the code submitted.

* Working prototype - 2

Code is now finally working - external perimeters are slowed down as needed when there is likelyhood of curling up.

ToDo:
1. Reslicing the model causes the algorithm not to run - need to find where this fails to trigger the call for this.
2. Slowdown of internal perimeters not working yet.

* Updated to use overhang wall speed instead of bridging speed for this algorithm

* Fixed bug in speed calculation and tweaked parameters for high speed printer

Fixed bug in speed calculation and tweaked parameters for high speed printer

* Attempting to fix "set started" not being set

* Parameter tweak after print tests

* Fixed estimation not running when model is re-sliced.

* Removing debug printf statements and fixed threading flag.

* Fixed threading

* Parameter tweaks following print tests

* Made this as an option in the GUI

* Reintroduced handling of bridges as per original design

* UI line toggling when option makes sense to be visible.

* Fixed bug in field visibility & made it default to off

* Code optimisation

* Initial commit of code from Prusa Slicer 2.6.1

* Ported ExtrusionRole from Prusa Slicer 2.6.1

* fix compile errors

* Update GCode.hpp

* code changes to invoke pressure equalizer

* attempting to trigger pressure equalizer

(Not compiling)

* Update Fill.cpp

* Update Fill.cpp

* Pressure equaliser layer result update

* Further commits

* Merged PR https://github.com/prusa3d/PrusaSlicer/pull/9622

* First complete working version

* Update PressureEqualizer.cpp

* Implemented parameter in GUI

* Toggle fields according to compatibility

* Updated UI toggles between extrusion rate slope and arc fitting.

* Updated tooltip

* Introduced parameter smoothing segment length

This parameter influences the number of division a line will undergo in response to the requirement to adhere to the extrusion rate flow adjustment.

* Internal parameter and tool tip tweaking

* Parameter and tool tip tweaking

* Updated parameters and tooltip following testing.

* Sync PressureEq with latest PrusaSlicer

* Revert "Sync PressureEq with latest PrusaSlicer"

This reverts commit 131fb94c6b.

---------

Co-authored-by: MGunlogson <MGunlogson@users.noreply.github.com>
Co-authored-by: Vojtech Bubnik <bubnikv@gmail.com>

src/libslic3r/Print.cpp

@@ -150,10 +150,8 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
         "fan_max_speed",
         "printable_height",
         "slow_down_min_speed",
-#ifdef HAS_PRESSURE_EQUALIZER
-        "max_volumetric_extrusion_rate_slope_positive",
-        "max_volumetric_extrusion_rate_slope_negative",
-#endif /* HAS_PRESSURE_EQUALIZER */
+        "max_volumetric_extrusion_rate_slope",
+        "max_volumetric_extrusion_rate_slope_segment_length",
         "reduce_infill_retraction",
         "filename_format",
         "retraction_minimum_travel",