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/SLAPrintSteps.hpp

@@ -43,7 +43,7 @@ private:
     bool canceled() const { return m_print->canceled(); }
     void initialize_printer_input();
     
-    void apply_elefant_foot_compensation(SLAPrintObject &po, SliceOrigin o);
+    void apply_printer_corrections(SLAPrintObject &po, SliceOrigin o);
     
 public:
     Steps(SLAPrint *print);