[BUGFIX] Fixed data handler hook

All processed events are stored in a cache so that they can be
processed by the hook after the data handler has finished even
if the event is deleted.
[BUGFIX] Class name fixes

Some invalid class names after the namespace introduction are fixed.
[BUGFIX] Added missing t3ver_move_id fields

Since the versioningWS setting is set to "2" in the TCA configuration
the field t3ver_move_id is required in the database.
[TASK] Moved TypoScript configuration namespace

The plugin settings are moved from plugin.tx_czsimplecal_pi1 to
plugin.tx_czsimplecal so that all plugins can access them.
[TASK] Added PHPDoc for DateTime::modify()