Moved `xml` definitions to `atspi-common` #579

Job	Run time
find-msrv	5s
rustfmt	9s
wasm-compatible-common-crate	32s
no-unused-dependencies	15s
nightly Clippy	54s
coverage	1m 58s
rustdoc	41s
benchmarks	2m 21s
msrv-compliance	1m 17s
semver-compliance	1m 5s
tests	2m 0s
	11m 17s

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