[FEATURE] add sorting on sys_category

sys_category until now misses a specific sort order
and is sorted by title. Adding a sorting property
gives more flexibility in sorting by custom
needs.

tca treeConfig of sys_category as well as categoryRegistry
are adapted accordingly

Change-Id: I663fb24dcd5486f911e256fe1a42c445a63543be
Resolves: #51590
Releases: 6.2
Reviewed-on: https://review.typo3.org/23615
Reviewed-by: Francois Suter
Tested-by: Francois Suter
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer