Add "hh:mm:ss tt" to clock formats.

[z1nc0r3]

#1678 Added hh:mm:ss tt to the clock formats to show seconds in the clock.

[jjw24]

Hi there, thanks for the pr.

As @onesounds mentioned, there maybe a slight impact on memory, could you please test how much impact there will be. This can be showing a screenshot of before and after using this format.

We will also make it clear to users that this may impact memory. @onesounds what's the best way to do this? Tooltip or warnin text etc?

[jjw24]

See comments please.

[onesounds]

I'll test and then if there are lot memory using, I'll add description part.(aka tooltip)

[onesounds]

I have confirmed that resource usage does not increase in particular.
(Taoo and me have already checked the memory usage when inserting this feature.)
I think it would be okay not to add an explanation.

[jjw24]

Haven't had a chance to take a look, will do so soon

[z1nc0r3]

hh:mm:ss tt and HH:mm:ss tt are not the same.

[VictoriousRaptor]

hh:mm:ss tt and HH:mm:ss tt are not the same.

I know, but tt in HH:mm:ss tt is redundant.

LGTM