[TASK] Remove Flash Uploader Functionality

As there is a better HTML5 alternative in the
Backend since TYPO3 CMS 6.0, the
flash uploader has only little benefits anymore.

The patch removes all occurrences (except labels)
that are related to swfupload, as well as swfupload
itself.

Releases: 6.1
Resolves: #46510
Change-Id: I76ce06900b74de2e3cdc79caf9984e050bf40990
Reviewed-on: https://review.typo3.org/19146
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Mattias Nilsson
Tested-by: Mattias Nilsson
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack