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.