[!!!][TASK] Use protocol in pages.url and migrate pages.urltype

The field pages.urltype contains "0", "1", "2" which maps to a protocol,
however most people want to just paste the url in the "pages.url" field.

This change drops the DB field "pages.urltype" and merges the value
into "pages.url" directly.

Resolves: #71306
Releases: master
Change-Id: I309724ba48ac9c5674a75e79da6cbb6e4880e521
Reviewed-on: https://review.typo3.org/53198


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>