[TASK] Refactoring: Extract file upload for FAL

Move code to upload a file and store references for FAL in sys_file /
sys_file_reference from squad and member controller to the new FalUtility.
[TASK] Set line endings to lf for FalUtility
[BUGFIX] Updating squad image shows old image

Issue: After updating the image of a squad the previous image is still
shown.

Fix: Mark old images of the squad as deleted in sys_file_reference.

WARNING: This is more like a workaround.
[BUGFIX] updateAction should update not add
[FEATURE] Add updating of member image