Add more types for attr_container, e.g. uint8, uint32, uint64 Add more APIs for attr_container for int8, int16 and int32 types Rename fields of the union 'jvalue' and refactor some files that use attr_container
Fix the Dockerfile linter errors and most warnings
* update IoT APP store demo * update IoT app store apps * update IoT cloud demo document * [Cloud demo] mount app store between two dockers * [Cloud demo] update restart policy * [Cloud demo] update help page * [Cloud demo] update online demo address
With agreement from contributors.