In MeshSimplifier, change all computations to use 64-bit floats for higher precision. Fix several bugs reducing output visual quality, in particular (i) using the lower edge cost when one or the other edge end-point was chosen as the target vertex for collapse, and (ii) fixing how duplicate faces are detected.
In MeshSimplifier, change all computations to use 64-bit floats for higher precision. Fix several bugs reducing output visual quality, in particular (i) using the lower edge cost when one or the other edge end-point was chosen as the target vertex for collapse, and (ii) fixing how duplicate faces are detected.

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