app/lua53: catch up to lua 5.3.6 (#3415)
Adapt https://www.lua.org/work/diffs-lua-5.3.5-lua-5.3.6.html to NodeMCU. Mostly a straight application, but some small tweaks were required and, in lundump.c, some changes were elided and some additional diff reduction applied, as we have heavily diverged from upstream.
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