stdlib xmlunit testing support

<!-- https://jarcasting.com/artifacts/com.peterphi.std.guice/stdlib-xml-testing/ -->
<dependency>
    <groupId>com.peterphi.std.guice</groupId>
    <artifactId>stdlib-xml-testing</artifactId>
    <version>10.1.5</version>
</dependency>

// https://jarcasting.com/artifacts/com.peterphi.std.guice/stdlib-xml-testing/
implementation 'com.peterphi.std.guice:stdlib-xml-testing:10.1.5'

// https://jarcasting.com/artifacts/com.peterphi.std.guice/stdlib-xml-testing/
implementation ("com.peterphi.std.guice:stdlib-xml-testing:10.1.5")

'com.peterphi.std.guice:stdlib-xml-testing:jar:10.1.5'

<dependency org="com.peterphi.std.guice" name="stdlib-xml-testing" rev="10.1.5">
  <artifact name="stdlib-xml-testing" type="jar" />
</dependency>

@Grapes(
@Grab(group='com.peterphi.std.guice', module='stdlib-xml-testing', version='10.1.5')
)

libraryDependencies += "com.peterphi.std.guice" % "stdlib-xml-testing" % "10.1.5"

[com.peterphi.std.guice/stdlib-xml-testing "10.1.5"]