Usability improvements

- Now entity.key() is the same as entity.key.value
- Entity:serialize only serializes component given correctly
- Any other value inside the Entity is ignored
- Disable some diagnostics used in Lua language server by sumneko

concord/world.lua

@@ -476,6 +476,7 @@ end
 
 return setmetatable(World, {
    __call = function(_, ...)
+      ---@diagnostic disable-next-line: redundant-parameter
       return World.new(...)
    end,
 })