[TASK] Remove leading backslash in use statement(s)

Change-Id: I5bacaed40ffeecbf0231d41f60643985ab7bcf3a
[BUGFIX] Make TYPO3CR migration filters work on proxy nodes

When trying to migrate a workspace containing proxy nodes the try to
fetch the node type directly failed. This change adds a check for the
node being a proxy node and adjusts the access accordingly.

Change-Id: I99b56f257e1f0c006432caaf33a56b80da882a37
Merge "[TASK] Remove leading backslash in use statement(s)"
Merge "[FEATURE] Paginate widget: throw Page Not Found Exception"
[TASK] Add getCurrentDateTime to interface and add @api annotations

Change-Id: If51243d116ea1c3d22440708c2a4033df759fe45