[BUGFIX] Write config to extTables destroys HTML output

If you enter HTML to update a field in e.g. TCA to write the value into
extTables.php, then the HTML will be printed into the configuration
module.
htmlspecialchar the output.

Fixes: #46999
Releases: 6.1,6.0,4.7,4.5
Change-Id: I390b4252316b8bdf01e5bbcc5a8b33833bdf73e8
Reviewed-on: https://review.typo3.org/19709
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
[BUGFIX]  Hide move placeholder in WS preview

Move placeholder are visible in the navigation
during WS preview if they are moved for example
from the first to the second level.

Fixes: #38705
Releases: 6.1,6.0,4.7,4.5
Change-Id: I7bdeee0246bb34bdc5b8baf963fad6b262078877
Reviewed-on: https://review.typo3.org/19712
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack