doc mod support

Add note about args+named_args unification

More arg.type string defaulting

.cdb.json depends on README

Add shell.nix

Add CDB metadata and Makefile

Add README

Add license

Even stricter luacheck

Check mock_minetest.lua too

Fix luacheck warnings

Add luacheck config

Add min_minetest_version and description

Add type validation and conversion

Fix string match (again)

Organize code in directories

Add test

Fix string match

Split runner to separate file

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