XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Fix xwiki.cfg and pom.xml
Merge remote-tracking branch 'upstream/master' into feature-new-wiki-api
Merge pull request #52 from gdelhumeau/feature-new-wiki-api

XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.