Do EFC for the first faded layers of SLA, interpolate efc parameters

Compensated slices have negative orientation...


Move efc to common params


Fix elefant foot compensation reversed contours


Remove redundant assertions and don't apply absolute correction if zero

src/libslic3r/ElephantFootCompensation.cpp

@@ -592,6 +592,10 @@ ExPolygon elephant_foot_compensation(const ExPolygon &input_expoly, double min_c
 			assert(out_vec.size() == 1);
 		}
 	}
+    
+    // FIXME: orientations are messed up (Tamas)
+    out.contour.make_counter_clockwise();
+    for (auto &h : out.holes) h.make_clockwise();
 
 	return out;
 }