serializationFormat slingxml with xml output for Sling-Initial-Content

[mrozati]

add serializationFormat slingxml which can be used for XML outputs for Sling Initial Content. This generates the XML file with the clientlib name.

[stefanseifert]

looks good to me in general.

i was not able to execute the build/unit tests on my windows machine with this PR:

processing clientlib: test.base.apps.serializationFormatXML
Write node configuration using serialization format: xml
write clientlib json file: undefined
internal/fs/utils.js:453
    throw err;
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be one of type string, Buffer, or URL. Received type undefined

probably a windows-specific problem?

[stefanseifert]

uh, the changelog is outdated, it does not include the latest changes from 1.4.4, 1.5.0 and post-1.5.0.
next version will be 1.6.0

[mrozati]

oh, I committed my changed on top of master branch, but I just see now that there is also a develop branch, which is "behind" the master. looks that something is wrong here.

[stefanseifert]

@ifahrentholz please review

[mbehzad]

@mrozati , re: failed unit-test
the new getXmlOutputFile method does not return the contentXml value (from clientlib.js:256)
and one of the indentations for the xml output (clientlib.j:205) has one space too much (compared to the test snapshot and other lines in the xml output (:209, :211)

[mrozati]

thanks. I fixed them

[ifahrentholz]

@stefanseifert: On my machine the tests ran without an issue.