Move away from node-sloc

[simonrenoult]

What problem are you trying to solve?

Not really a feature but we depend on node-sloc to count file complexity. Which is far from being popular and is at risk of being abandoned one day.

Describe the feature

We should look into alternatives.

[eshimischi]

Not much alternatives, but scnt

[simonrenoult]

In the end, we'll keep node-sloc for simplicity sake and fallback to a manual line count when node-sloc does not support the file type.