[BUGFIX] Register missing icons and fix spriteicon registration

This patch register some missing icons and fix the automatic
registration for sprite icons which path starts with sysext/.

Resolves: #70305
Releases: master
Change-Id: If935c74046118d75160f093c8fee1a05164620fd
Reviewed-on: http://review.typo3.org/43737


Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>