Fixes

• fix S7 ISOTCP plugin failed to read T&C area of Siemens 200/200smart.
• fix SparkPlugB plugin failed to decode DCMD topic.
• fix File plugin failed to turn on debug.
• fix(UI): cant not export/import tag.
• fix(UI): static tag cannot be refreshed automatically.
• fix(UI): can not create Source.
• fix(UI): can not display hexadecimal of tag value.
• fix(UI): unable to use test connection.

Chroes

• Remove CPU usage information in About.