WPP

Add wotlk classic SMSG_ITEM_CHANGED #1051

Job	Run time
build (windows-latest, Release)	2m 56s
build (ubuntu-latest, Debug)	1m 28s
build (ubuntu-latest, Release)	1m 26s
build (macos-14, Release)	2m 0s
build (windows-latest, Debug)	3m 37s
build (macos-14, Debug)	2m 4s
	13m 31s

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