gst: deprecate `maybe_field()` setters in favor of `field_if_some()`
Some builder convenience setters where added to work with Option
al values.
This is the case for the Pad
builder setter maybe_name()
which was
introduced as part of this MR.
Then more convenience setters were discussed and it was decided to use
field_if_some()
instead of maybe_field()
. Existing maybe_field()
s were
kept for backward compatibility. This commit marks them as deprecated,
referring to the matching field_if_some()
.
Fixes: #529 (closed)