Issue #6473 - canonicalPath refactor & fix alias check in PathResource
* Reverted %-escape handling for URI query parts.
* Performing canonicalization in ServletContext.getResource(),
and improving alias checking in ContextHandler.getResource().
* Performing canonicalization checks in Resource.addPath() to avoid
navigation above of the root.
* Test added and fixed.
* Various cleanups.
* Improved javadoc and comments
* Compliance mode HttpURI uses UriCompliance.Violation
Signed-off-by: Lachlan Roberts <lachlan@webtide.com>
Signed-off-by: Simone Bordet <simone.bordet@gmail.com>
Co-authored-by: Greg Wilkins <gregw@webtide.com>