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Add *Update methods to update an existing tag (#24)

This is useful to avoid a double lookup: once to find the current
value, the second time to update its value. The tag could be a counter
we want to update or, with the generics tree, any struct/map.

`SetOrUpdate()` is the same as `Set()`, but when there already is a
tag, it is passed to the provided update function instead of being
replaced by the provided tag value. If no match, the provided tag
value is used instead.

`AddOrUpdate()` is the same as `Add()` and works like `Set()` except
it will append a tag (when no match) or modify the first matching
tag (when there is a match).

Both functions take a tag value which is used when the existing tag
does not exist (no tag for `SetOrUpdate()` or no matching tag for
`AddOrUpdate()`). Both functions take an update function which is used
when there is an existing tag and the update function is applied on
the existing tag to get another tag. The provided tag is therefore
ignored in this case.

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