config: return value + "was set" for each config property

At the property level, the isDefault retval exposed whether the
property value was set explicitly in the config or taken from the
property default. That information got lost at the
SyncConfig/SyncSourceConfig level although there are cases where that
is relevant (like providing better error messages, BMC #23783).

Now that level uses the new InitState classes instead of plain
int/bool/std::string return values. Code which assigns these return
values to local variables doesn't need to be adapted. Directly using
the return value in an expression might need some work (typically
adding a get() if the compiler cannot infer the desired
type). Overriding the virtual methods always needs to be adapted.

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