by using XmlStringBuilder. Fixes SMACK-577
Also extend LazyStringBuilder with a cache. And extend XmlStringBuilder
with some more convenience methods.
Move the ELEMENT and NAMESPACE definition from Form to DataForm, where
it belongs.
that method never worked correctly since 11 years, ie. the PrivateData
was never added as element text. It's not surprisingly that this was not
discovered in more then a decade, since Smack usually never *sends*
those stanza but only receives them.
But that's no reason to not fix it. :)
instead of using the old baseName=smack appendix=project.name approach,
we are now going convention over configuration and renaming the
subprojects directories to the proper name.
Having a prefix is actually very helpful, because the resulting
libraries will be named like the subproject. And a core-4.0.0-rc1.jar is
not as explicit about what it actually *is* as a
smack-core-4.0.0-rc1.jar.
SMACK-265
