Merge branch 'make_unique' into 'master'
Update OVM, implement ptr::unique_ptr. This needs to be one commit as the OVM ptr namespace change is incompatible with the current namespace alias (ptr=std), and vice-versa. This updates the submodule to the branch referenced in [OVM PR 13](https://graphics.rwth-aachen.de:9000/OpenVolumeMesh/OpenVolumeMesh/merge_requests/13) and should reference the merge commit in master instead before being merged here. See merge request !190
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