[no squash] Optimizations and code quality improvements #83
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This eliminates the need of iterating the whole list for every protection operations. Note that the highest index isn't cached, i.e. the first or few (if there are many holes) operations would still suffer from the lag.
On newer Minetest servers, handles saving jobs in async environment. To prevent conflicts, the save file is locked whie saving, and if a code requests saving while the file is locked, data is saved again immediately after finishing the current save.
startTime is not used anywhere else, so localizing it makes sense and saves memory.
This may add lag, but stops saving entities (which lua_api.md discourages). This also eliminates areas.markPos{1,2} (which seemed to be internal) and integrates areas:setPos{1,2} with such function.
Merges "pos1" and "pos1only" into the same code.
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This PR optimizes some parts and improves code quality by following
lua_api.mdrecommendations.Check individual commits for what this PR does and why the changes are made.
For "Prevent saving entities": Due to how
static_save = falseworks, old entities may linger but disappear after punching them or restarting the server again.This PR is ready for review.