XCONTRIB-227: Publish a Wiki Editor tools version installable with the Extension Manager
* Set version to 2.0 since 1.0 and 1.1 have already been published in some "adhoc" manners...
* Rename modules to remove the xwiki-platform prefix since we're publishing this extension as a contrib extension as a first step before proposing it to the platform in the future
* use a org.xwiki.contrib.editortool groupid since we have several artifacts to publish
* set EM metadata in the pom.xml files (names and aliases)
* fix poms: fix property names, fix versions, fix missing dependencies
* fix functional test to make it pass (although it still doesn't do much)
* add missing developers
* hide technical pages