* removed global lock
* fixed warnings

- Building the internal qhull version fails on Ubuntu18.04
- Therefore, the included qhull version is removed

Added step params.
Fixed distrubition range and use ClampedNormalDistribution

Implemented mode regarding the face areas

* modernize-shrink-to-fit
* modernize-use-nullptr
* modernize-use-equals-default
* modernize-use-equals-delete
* modernize-unary-static-assert
* modernize-use-bool-literals
* modernize-replace-random-shuffle

    modernize-avoid-bind
    modernize-deprecated-headers
    modernize-redundant-void-arg
    modernize-replace-auto-ptr