Upgrade to CSS4J 2.0.5

CSS4J CHANGES
=============

Version 2.0.5
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 * Core:
- NSAC impl.: protect against Billion Laughs Attack in var() values.
- CSSOM: use the Denial of Service prevention introduced in [02da0213].
- CSSOM: if a lexical value contained many var() references, some could be left 
  unreplaced.
- CSSOM: add a public setLexicalUnit(LexicalUnit) method to LexicalValue.
- CSSOM: clone() some lexical values before operating on them.
- CSSOM: some corner cases of custom properties being used to set shorthands 
  did not work.
- PropertyDatabase: add a few level 4 font properties.
- Tests: add a test for Billion Laughs Attack on var() values.
- Maven POM: make sure that javadocs are built with JDK 14.
- Maven POM: produce a package-list with javadoc-packagelist-maven-plugin.
- Maven POM: general cleanup.

 * Dom4j module:
- Maven POM: make sure that javadocs are built with JDK 14.
- Maven POM: general clean-up.

 * Agent module:
- Maven POM: make sure that javadocs are built with JDK 14.
- Maven POM: general clean-up.

 * AWT module:
- Maven POM: general clean-up.