XWIKI-10341: Integrate LESS CSS into XWiki Platform.
XWIKI-10341: Integrate LESS CSS into XWiki Platform.

* Bug fix.
XWIKI-10341: Integrate LESS CSS into XWiki Platform.

* Clean the cache at startup.
XWIKI-10341: Integrate LESS CSS into XWiki Platform.

* Remove the useless dependency for batik-js on oldcore, which collide with Rhino (used by lesscss-java).
Merge branch 'feature-less-integration'