Lua 5.5 has been released and brings a few breaking changes that not all our packages and apps are going to accommodate. I've introduced a `lua54` package based on the current `lua` package and bumped `lua` to 5.5 in staging.

All package that depend on `lua` need to be rebuilt to make sure they either already support Lua 5.5 and get built with the new paths or to find out that they don't work and change their dependency to `lua54`, also rebuilding to make sure the path to Lua binaries is only discovered as `lua5.4`, not plain `lua`.

Packages that provide libraries need to have an additional split packages made available for `lua54-*` variants with `lua-` variants being replaced with the 5.5 builds.

All rebuilds to staging.

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*WARNING*: Packages with dependencies on Lua libraries need to be rebuilt *after* their dependencies have been. Currently it's possible to do a rebuild of many packages against the new Lua version but with old library builds and the builds will not even notice because most packages don't have runtime checks that cover this.