Fix crashes with entity references and predefined entities

Closes GH-13004.

Revert "Fix crashes with entity references and predefined entities"

This reverts commit 3fa5af8496bdbc74e24828b790e4acfd6a26f0d4.

Fix crashes with entity references and predefined entities

There's two issues here:
- freeing of predefined entity declaration crashes (unique to 8.3 & master)
- using multiple entit

Fix crashes with entity references and predefined entities

There's two issues here:
- freeing of predefined entity declaration crashes (unique to 8.3 & master)
- using multiple entity references for a single entity declaration crashes
(since forever)

The fix for the last issue is fairly easy to do on 8.3, but may require a
slightly different approach on 8.2. Therefore, for now this is 8.3-only.

Closes GH-13004.

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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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