Implemented automatic setting of clock display from network time.

[adebeun]

Description:

The display of the AZ7798 CO2 meter includes a clock showing date and time.This is normally set manually but slowly drifts or is reset when the power is off for too long. This enhancement automatically sets the clock time from the network time, shortly after power on and then every 24 hours thereafter.

Related issue (if applicable): fixes #

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched (Also remember to add to changelog.ino file without updating version)
• Only one feature/fix was added per PR.
• The code change is tested and works.
• The code change pass travis tests. Your PR cannot be merged unless tests pass
• I accept the CLA.

[ascillato]

Hi,

Please complete the checklist. Thanks

[arendst]

Pls remove changes from _changelog.ino as it interferes with current file.

[adebeun]

You checklist confused me. The second item includes "(Also remember to add to changelog.ino file without updating version)". What do you mean by that?

[arendst]

I know. I'll remove it as I want PR's to be as small as possible.