DTU Evaluation Code

This is a fixed and improved version of the original Matlab DTU evaluation code. Some of the changes:

• fix computed evaluation score to consider only points validated by the scene mask
• fix MaxDistCP to compute the true score, regardless of the set MaxDist value
• evaluation code now supports as input both mesh and points-cloud; eval_ply automatically detects the right mode
• re-implement some core components in C++ in order to speed-up evaluation (20x on average)

See an usage example in runTest.bat. Tested with Matlab R2019b trial version.