[!!!][FEATURE] Replace ExtJS page tree

The ExtJS/ExtDirect based page tree has been replaced with
new implementation based on SVG.

Refactoring and performance improvement of the PHP side
(tree data provider) will be done in the followup patch.

Releases: master
Resolves: #82426
Change-Id: I502a085da939ebe2561d2b7a17cc8347e5101623
Reviewed-on: https://review.typo3.org/51594


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>