Separate support tree routing and meshing, remove Common.hpp/.cpp .

* Remove Common.hpp and Common.cpp, move things into their respective modules in sla.

src/libslic3r/SLA/EigenMesh3D.hpp

@@ -1,8 +1,10 @@
 #ifndef SLA_EIGENMESH3D_H
 #define SLA_EIGENMESH3D_H
 
-#include <libslic3r/SLA/Common.hpp>
+#include <memory>
+#include <vector>
 
+#include <libslic3r/Point.hpp>
 
 // There is an implementation of a hole-aware raycaster that was eventually
 // not used in production version. It is now hidden under following define
@@ -19,6 +21,8 @@ class TriangleMesh;
 
 namespace sla {
 
+using PointSet = Eigen::MatrixXd;
+
 /// An index-triangle structure for libIGL functions. Also serves as an
 /// alternative (raw) input format for the SLASupportTree.
 //  Implemented in libslic3r/SLA/Common.cpp