* More consistent prefix.

[Misc] Since we use a third-party connection pool (DBCP by default) we don't need to set Hibernat's internal pool configuration (they're not used). See https://docs.jboss.org/hibernate/orm/3.3/reference/en-US/html/session-configuration.html#configuration-hibernatejdbc for example.

+ Move functional tests to platform

* Make minimal XWiki runtime smaller (that was my original goal for using Servlet 3.0 :))

* Fixed artifact ids to comply with rule

XWIKI-12884: No way to specify a webjars URL for a resource located in another wiki
XWIKI-12878: Webjar installed by EM on a subwiki could not be loaded through the webjar action

* Fix functional tests in platform.

* forgot start_xwiki_debug scripts

* add missing parameter
* add missing Windows seup

[Misc] Removed leftover from XWIKI-12045 ("Remove xwiki-platform-legacy-crypto-script module"). Thanks to Denis for noticing it.

* Rollbacking since it wasn't a good idea, see the issue for details