Struct DateTimeFrac

DateTime doesn't support milliseconds, but SDLang's "Date Time" type does.

So this is needed for any SDL "Date Time" that doesn't include a time zone.

Name	Type	Description
`dateTime`	`std.datetime.DateTime`
`fracSecs`	`core.time.Duration`

Name	Type	Description
`fracSec` [get]	`core.time.FracSec`
`fracSec` [set]	`core.time.FracSec`

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