[core] Add cgroups support to meshroom

[servantftechnicolor]

CGroups on linux may limit the memory and the number of cpus

Without getting the specific information about these limits, we may overshoot our memory usage and core usage, creating crashes.

This PR will read the values as specified by the specifications.

Rely on alicevision/AliceVision#1304.

[fabiencastan]

We need to find a way for nodes to declare if they supports these arguments or rely on environment variables.
We have many nodes launching external commands (like blender).
We could for instance create an intermediate class for AVCommandLineNode.

[mh0g]

we could use a chunk.node.nodeDesc.commandLine.startswith("aliceVision_") to do this only on the proper nodes

[mh0g]

a warning in the log when the feature is used may be usefull

[mh0g]

Tested on windows, no effect (as expected).
Note: the class solution changes the uid of the nodes, this forces to recompute projects.