[!!!][TASK] Remove EXT:jumpurl from the core

The JumpURL generation and handling which was put
into its own extension is now removed from the core.

It is now maintained on GitHub:

https://github.com/FriendsOfTYPO3/jumpurl

Resolves: #70578
Releases: master
Change-Id: Icf8436967d0d575c3d2199f46eb39fb76a8b366e
Reviewed-on: https://review.typo3.org/44341


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>