[FEATURE] Allow native ExtJS3 Modules in ContentArea

Adds the JS basement to use ExtJS Cards in TYPO3.
Adds Api to t3lib_extMgm to add an ExtJS card
Changes xtype:modulepanel to fire events, if iframe uri has changed

Change-Id: I361ba02d09715b65165da851b28361a8bd8bca26
Resolves: #32309
Releases: 4.7
Reviewed-on: http://review.typo3.org/7395
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter