Fix various namespace prefix conflict resolution bugs and namespace shift bugs

There are two linked issues:

- Conflicts couldn't be resolved by changing the prefix name.
- Lacki

Fix various namespace prefix conflict resolution bugs and namespace shift bugs

There are two linked issues:

- Conflicts couldn't be resolved by changing the prefix name.
- Lacking a prefix would shift the namespace as the default namespace,
causing elements to suddenly become part of the namespace instead of
the attributes.

The output could still be improved by removing redundant namespace
declarations, but that's another issue. At least the output is
correct now.

Closes GH-11777.

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Fix GH-9628: Implicitly removing nodes from \DOMDocument breaks existing references

Change the way lifetime works in ext/libxml and ext/dom

Previously, a node could be freed even wh

Fix GH-9628: Implicitly removing nodes from \DOMDocument breaks existing references

Change the way lifetime works in ext/libxml and ext/dom

Previously, a node could be freed even when holding a userland reference
to it. This resulted in exceptions when trying to access that node after
it has been implicitly or explicitly removed. After this patch, a node
will only be freed when the last userland reference disappears.

Fixes GH-9628.
Closes GH-11576.

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