Release v0.7.0

[BUGFIX] Add CodeSample for TcaMigrationRector
[TASK] Add TCA migration (#1522)
[TASK] Update rector to version 0.8.52 (#1667)
[TASK] Use EXT: prefix for iconfile in TCA (#1665)
[BUGFIX] Add test directory without Rector suffix
[TASK] Add rector to set (#1664)
[TASK] Cleanup bootstrap.php
[BUGFIX] Add new test case (#1663)
[TASK] Add ValidatorResolverDynamicReturnTypeExtension