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/component.lua

@@ -95,6 +95,7 @@ end
 function Component:__initialize(entity, ...)
    local component = self:__new(entity)
 
+   ---@diagnostic disable-next-line: redundant-parameter
    self.__populate(component, ...)
 
    return component