Add versioned dependencies for Lua modules and create Rocks for LuaRocks

[HHHartmann]

I think in the light of hybrid c/lua modules and LFS modules we need a versioning and dependency definition for Lua modules including a version definition for the underlying firmware.

We should create Rocks for the Lua Modules and Hybrid Modules. So it is easy to obtain matching Lua sources for your firmware binary, no matter where you got it from. (online build service or self built)

A challenge might be to define the version of the firmware, so that LuaRocks can detect it to pull matching Rocks.

Ideally this would create an ecosystem which can be used to manage modules external to this project.

Workarounds

Get the files form the matching source tree knowing what you do.

[HHHartmann]

See here for defining dependencies in LuaRocks https://github.com/luarocks/luarocks/wiki/Dependencies.
Also related: #386

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