build: Scan for modules in the external contrib directory ../ns-3-external-contrib

Gabriel Ferreirarequested to merge
Gabrielcarvfer/ns-3-dev:ExternalContribDir into master

User request from some time ago https://groups.google.com/g/ns-developers/c/g-Ec9Ovuy8s

Basically allows people to use contrib modules without making them full cmake projects that just link to a pre-build ns-3 subproject. Just dump the contrib modules into external contrib, configure and profit. This way they can manage things in the same top-level project, use all existing macros, tooling, etc.

  • top-level directory
    • ns-3-dev
    • ns-3-external-contrib
Edited by Gabriel Ferreira

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