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Rework ClockTime & optional formatted values

François Laignel requested to merge fengalin/gstreamer-rs:opt-int-types-rework into master

This MR aims at fixing #234 (closed).

IMHO, all the machinery is in place, however this requires a survey of the functions in order to identify candidates for mandatory arguments and/or return values.

Just like for the *Result MR, the design relies on the new TryFromGlib trait defined in gtk-rs/glib. This trait allows glib types with an undefined value to be constructed as an Option<T>. This MR also uses the gir un-merged changes so that the we can auto-generate some functions which benefit from Result<*Success, *Error> as a return value or as an argument.

See below for illustrations of usage.

Edited by François Laignel

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