[feature request] Allow enabling/disabling timezone / calendar / clock individually via config

[mryan43]

It would be really cool if we could enable/disable the display of timezone, calendar and clock individually, it could look something like this in the config :

display_timezone (true|false)
display_calendar (true|false)
display_clock (true|false)

All with default value "true" for backwards compatibility.

Cheers !