mallocMC release 2.0.0crp

This release introduces mallocMC, which contains the previous algorithm and much code from ScatterAlloc 1.0.2crp. The project was renamed due to massive restructurization and because the code uses ScatterAlloc as a reference algorithm, but can be extended to include other allocators in the future.

We closed all issues documented in [Milestone *Get Lib ready for PIConGPU*](https://github.com/ComputationalRadiationPhysics/mallocMC/issues?milestone=2&state=closed).