Remove deprecated classes

 Remove deprecated classes : 
- `IntegralInvariantGaussianCurvatureEstimator`
- `IntegralInvariantMeanCurvatureEstimator`. 

Use instead `IntegralInvariantVolumeEstimator` or `IntegralInvariantCovarianceEstimator` with good functor from `IIGeometricFunctors`

:octocat: