[!!!][TASK] Move non-namespaced classes into correct places

There are a few leftover classes inside typo3/ which
haven't been moved or migrated yet into the according
places.

1. typo3/move_el.php. The extension classes
to PagePositionMap are now moved to
EXT:backend/Classes/Tree/View with according
names.

2. typo3/class.browse_links.php - several extensions
to the PageTreeView and the FolderTreeView.

3. typo3/db_new.php - an extension to the PageTreeView
is now located in EXT:backend/Tree/View/NewRecordPageTreeView

The base classes (localPageTree and localFolderTree)
have been moved to
EXT:backend/Classes/Tree/View/ElementBrowser*.

The subclasses for recordlist (regular record picker)
are moved into EXT:recordlist.

The subclasses used in RTEhtmlarea are adopted to
use the new naming scheme.

All calls within the core have been adopted. As
backwards compatibility, the old class names are
added to EXT:compatibility6.

3. The ext_autoload.php inside EXT:core is therefore
not needed anymore, the call inside Bootstrap is
not needed anymore.

Resolves: #64516
Releases: master
Change-Id: I926baace282d6e95d73607f974cd91296d2df890
Reviewed-on: http://review.typo3.org/36276


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>