Fan Speed Delay + Fan Kickstart Feature (#910)

Initial commit for fan speed delay, required some changes when porting from SuperSlicer.

Co-authored-by: SoftFever <softfeverever@gmail.com>

src/libslic3r/GCode.hpp

@@ -10,6 +10,7 @@
 #include "PrintConfig.hpp"
 #include "GCode/AvoidCrossingPerimeters.hpp"
 #include "GCode/CoolingBuffer.hpp"
+#include "GCode/FanMover.hpp"
 #include "GCode/RetractWhenCrossingPerimeters.hpp"
 #include "GCode/SpiralVase.hpp"
 #include "GCode/ToolOrdering.hpp"
@@ -491,6 +492,9 @@ private:
     // Processor
     GCodeProcessor m_processor;
 
+    //some post-processing on the file, with their data class
+    std::unique_ptr<FanMover> m_fan_mover;
+
     // BBS
     Print* m_curr_print = nullptr;
     unsigned int m_toolchange_count;