[FEATURE] Add api for rsaauth encryption

This patch introduces new API which eases the use of RSA encryption
across the core and for third party extensions.

For backend encryption a new RequireJS module is included which finds
fields to encrypt automatically by their data attribute.

For frontend encryption the JavaScript was rewritten to work the same
way the RequireJS module works but with plain (vanilla) JavaScript.

Releases: master
Resolves: #67932
Resolves: #34568
Change-Id: Id35dd65d1019a8c16858f03989ff48e3434698e4
Reviewed-on: http://review.typo3.org/40938


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>