Global: Adds units to time values

[muramura]

Elapsed time includes seconds, milliseconds, and microseconds.
The elapsed time determination comment states that 3000 is 3 seconds.
I add time units to the time value.
By adding the unit to the time value, it is easy to recognize that it is seconds, milliseconds, or microseconds.

I plan to do a PR on the library in the future.

test program

[rmackay9]

Hi, thanks for the PR but I think it would be better to instead add _ms to the end of some of the variables like "loiter_time" (e.g. make it "loiter_time_ms").

[peterbarker]

Sorry, but I don't think improves the readability.

I mean, great hack, I didn't even realise that was possible, but we do try to keep our use of the language to things everyone will be relatively familiar withg. The proposed use of this cleverness would be widespread, meaning it might surprise a lot of people.

Sorry, closing this one.