XWIKI-9723: Potential memory leak in Link Checker
XWIKI-9724: Introduce configuration parameter for the link checker to exclude pages from being checked
XWIKI-9704: Some icons are missing in the top menu on subwikis.

* Remove WikiManager.Style and put it on resources instead.
XWIKI-9476: Impossible to import a large wiki from a XAR
* missing events
Revert modification committed by mistake
Merge pull request #209 from gdelhumeau/XWIKI-9704

XWIKI-9704: Some icons are missing in the top menu on subwikis.
XWIKI-9476: Impossible to import a large wiki from a XAR
* allow configuring encoding for package.xml file
XWIKI-9476: Impossible to import a large wiki from a XAR
XWIKI-9725: Improve the way the custom interval is specified in the date search facet
Merge remote-tracking branch 'upstream/master' into XWIKI-9697