[BUGFIX] Label in list view is not escaped

The label of a field in the list view is not escaped,
as the itemLabel function is broken, through the
third parameter which cannot be HSCed afterwards
if it contains HTML.

Change-Id: I5adcf0ce97dd9f5e8fd9546b367f55f1ac0c532e
Fixes: #29409
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/20508
Reviewed-by: Nicole Cordes
Tested-by: Nicole Cordes
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
[BUGFIX] Remove 1000 pixelx limitation for preview image

There is a limitation of 1000 pixels width / height when creating a
preview image, also known as ProcessedFile::CONTEXT_IMAGEPREVIEW

The limitation is artificial and subjective and should be removed letting
more freedom to the system, e.g for generating banner which are quite
large.

Change-Id: Id86c5491437a32b0011b4fe29129c3ee433712af
Resolves: #47846
Releases: 6.2, 6.1
Reviewed-on: https://review.typo3.org/20695
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters