* Immutable ResourceCollection with mount management.
* Internal List<Resource> is now immutable so that .getResources() cannot be modified.
* Improved Resource.toJarFileUri implementation that keeps the deep archive references
* Introducing Resource.mountCollection() methods
+ ResourceCollection is now a private class
+ Resource.mountCollection() returns a Mount
+ Places that use this technique are now putting the Mount in the context's beans for the context to close those mounts.
* Cleanup names/comments in FileSystemResourceTest
* Adding missing test of attempting to create a Resource from a URI `jar:file:foo.jar!/` while not mounted.
* Reworked ResourceCollection behaviors based on feedback.
+ Eliminated all Resource.mountCollection() methods except the Collection<URI> one.
* Eliminated Resource.mountIfNeeded(Resource)
* Eliminated Resource.fromList implementations
* Introduced @gregw Resource.of() implementations
* Introduced Resource.split() to honor old split logic from Jetty 9/10/11, with glob support, but now it only converts to List<URI>
* Remove IOException from Mount.root() method
* ResourceCollection now flattens and uniques any nested ResourceCollection entries it encounters
* Expanded ResourceCollectionTest to cover more code paths
* Add ResourceTest for new split() method
* Fixing testcase to use a directory that exists on setExtraClasspath
* Increase reliability of WebAppContextTests
* Updates for working with webapp.extraClasspath
* Introduced Resource.unwrapContainer to help in servlet cases where the raw JAR path should be represented in a ServletContext attribute.
* Made FileSystemPool.containerUri just use new Resource.unwrapContainer
* webapp MetaData updated to use URIs references to Libs (not File objects)
* jetty-ee#-maven-plugin use URIs for its classpath tracking to aid in mounting issues later
* webapp extraClasspath supports raw JAR references as well as glob now, supported by Resource.split(String)
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