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.
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
