NXP-12390: add jQuery Ambiance plugin

Conflicts:
	nuxeo-platform-webapp-core/src/main/resources/OSGI-INF/theme-contrib.xml
NXP-12390: fix jquery.ambiance.js script to use 'jQuery' instead of $
NXP-12390: Update styles of admin messages and add a close button
NXP-12390: Update styles of admin messages and add a close button
NXP-12390: make it possible to specify a 'cssClass' when creating a notification with jQuery Ambiance
NXP-12390: Update feedback and status messages styles
NXP-12390: push safe edit notifications on jQuery Ambiance plugin

Conflicts:
	nuxeo-platform-webapp/src/main/resources/web/nuxeo.war/incl/doubleClick_shield.xhtml
NXP-12390: update confirm / discard link style
NXP-11795: remove Google Chrome Frame
NXP-12390: make the admin message closable
NXP-12390: rename 'cssClass' to 'className'; always add 'ambiance-*'
class and 'className' to the note.
NXP-12390: prevent default click event when closing the admin message