Adapt standard libraries to support memories by LuaMemory.#1

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renatomaia wants to merge 2 commits intov5.3from v5.3_memory

+68-41

Commits on Mar 5, 2019

Adapt standard libraries to support memories by LuaMemory.
renatomaia
committed

Commits on Jul 10, 2019

Fix 'unpack(z, v)' to not rely on the '\0' of Lua strings.
renatomaia
committed