Easy3D-v2.5.3

Changes

• Added support to the MinGW compiler.
• The OBJ format loader can handle per-vertex color attributes.
• Added a few matrix algorithms (SVD, inverse, determinant, least squares solver).
• Kd-trees can be created from an array of 3D points (not only PointCloud).
• Added a function to compute the perpendicular feet of two 3D lines.
• More robust face normal calculation for concave faces in SurfaceMesh.
• Added algorithms for convex partition of polygons.
• Added screen-constrained manipulation (rotation and translation).
• Added Viewer::bind(...) and Viewer::set_usage(...) for easier executing user functions.
• Fixed various bugs and warnings.