Add the full source of BambuStudio

using version 1.0.10

src/libslic3r/QuadricEdgeCollapse.hpp

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+// paper: https://people.eecs.berkeley.edu/~jrs/meshpapers/GarlandHeckbert2.pdf
+// sum up: https://users.csc.calpoly.edu/~zwood/teaching/csc570/final06/jseeba/
+// inspiration: https://github.com/sp4cerat/Fast-Quadric-Mesh-Simplification
+
+#include <cstdint>
+#include <functional>
+#include "TriangleMesh.hpp"
+
+namespace Slic3r {
+
+/// <summary>
+/// Simplify mesh by Quadric metric
+/// </summary>
+/// <param name="its">IN/OUT triangle mesh to be simplified.</param>
+/// <param name="triangle_count">Wanted triangle count.</param>
+/// <param name="max_error">Maximal Quadric for reduce.
+/// When nullptr then max float is used
+/// Output: Last used ErrorValue to collapse edge</param>
+/// <param name="throw_on_cancel">Could stop process of calculation.</param>
+/// <param name="statusfn">Give a feed back to user about progress. Values 1 - 100</param>
+void its_quadric_edge_collapse(
+    indexed_triangle_set &    its,
+    uint32_t                  triangle_count  = 0,
+    float *                   max_error       = nullptr,
+    std::function<void(void)> throw_on_cancel = nullptr,
+    std::function<void(int)>  statusfn        = nullptr);
+
+} // namespace Slic3r