Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/libnest2d/src/libnest2d.cpp

@@ -0,0 +1,26 @@
+#include <libnest2d/libnest2d.hpp>
+
+namespace libnest2d {
+
+template class _Nester<NfpPlacer, FirstFitSelection>;
+template class _Nester<BottomLeftPlacer, FirstFitSelection>;
+
+template std::size_t _Nester<NfpPlacer, FirstFitSelection>::execute(
+        std::vector<Item>::iterator, std::vector<Item>::iterator);
+template std::size_t _Nester<BottomLeftPlacer, FirstFitSelection>::execute(
+        std::vector<Item>::iterator, std::vector<Item>::iterator);
+
+template std::size_t nest(std::vector<Item>::iterator from,
+                          std::vector<Item>::iterator to,
+                          const Box & bin,
+                          Coord dist,
+                          const NestConfig<NfpPlacer, FirstFitSelection> &cfg,
+                          NestControl ctl);
+
+template std::size_t nest(std::vector<Item>::iterator from,
+                          std::vector<Item>::iterator to,
+                          const Box & bin,
+                          Coord dist,
+                          const NestConfig<BottomLeftPlacer, FirstFitSelection> &cfg,
+                          NestControl ctl);
+}