v2.0.0

New features:

1. Extended monitoring function, supporting data acquisition, status monitoring and event alarm of multiple protocols.
2. Add support data persistence option.
3. Add support for rule linkage and data forwarding.
4. Update account authority management.
5. Support device positioning and map display.
6. Multi-dimensional statistical device and event information on overview page.
7. Supplement all message notification channels, currently including email, DingTalk
8. Update UI