* introduce filter proxy helper for parsers
* introduce standard unknown events
* add various helpers for StAX (probably more to come)

XCOMMONS-441: Environment's getResource should return null if resource not found instead of Exception

* use the right class

* better support of SNAPSHOT version

* Moved to commons

* exclude asm to avoid conclict with other modules (we don't need it anyway)

* fix mistake in previous commit

* Forgot @since

XCOMMONS-435 : Add a tool to sanitize query string

XCOMMONS-282: Move from org.sonatype.aether to org.eclipse.aether

* various improvements

* add anotation to indicate default value of an event parameter

* various improvements

[Misc] Use String.format() to have more readable strings + reduce code violations for duplicated strings. Future: Have our exception classes accept sprintf in constructors.