Add tidyNode::getNextSibling() and tidyNode::getPreviousSibling()

These get the next and previous sibling nodes, respectively.
We can already kind of do this by using the $child array, b

Add tidyNode::getNextSibling() and tidyNode::getPreviousSibling()

These get the next and previous sibling nodes, respectively.
We can already kind of do this by using the $child array, but that's
inconvenient when actually walking the tree by only using node
instances. Since the class is final, there is no BC break here.

Closes GH-15047.

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Declare ext/tidy constants in stubs (#9383)

Declare tidyNode properties as readonly

Declare tidy properties

Declare tentative return types for ext/tidy

Closes GH-6999

Generate class entries for snmp, soap, sockets, sodium, sqlite3, sysv*, tidy

Closes GH-6696

tidy::repairFile() and ::repairString() return string|false

Verify parameter names of function aliases

Closes GH-6335

Update ext/tidy parameter names

Closes GH-6283.

Fix UNKNOWN default values in various extensions

Closes GH-6075

Add more precise type info for stubs

Closes GH-6005

Fix [-Wundef] warning in Tidy extension

Generate function entries from stubs for a couple of extensions

Migrates ext/standard, ext/tidy, ext/tokenizer,
ext/xml, ext/xml_reader, and ext/xml_writer. Closes GH-5381.

Revert "Replace @param annotations with type declarations"

This reverts commit c31029f335ca1b453af799805c43c37e959ad555.

Replace @param annotations with type declarations

Add union return types with one class

Add union return types for function stubs

Fix arginfo of tidy_repair_string()

Cf. 5356bad8c66d9df437c5136d02f6654a5b56b2b9.

Add ext/tidy stubs