MERGE: Merge branch '7.3' into 8.0

# Conflicts:
#	Neos.Cache/Classes/Backend/PdoBackend.php
#	Neos.Cache/Classes/Backend/RedisBackend.php
#	Neos.Cache/Classes/Backend/SimpleFileBackend.php
#	Neos.Cache/Classes/Frontend/CacheEntryIterator.php
#	Neos.Eel/Classes/FlowQuery/FlowQuery.php
#	Neos.Eel/Classes/FlowQuery/Operations/Object/FilterOperation.php
#	Neos.Eel/Classes/Helper/MathHelper.php
#	Neos.Eel/Classes/Helper/StringHelper.php
#	Neos.Eel/Tests/Unit/Fixtures/TestArrayIterator.php
#	Neos.Eel/composer.json
#	Neos.Flow.Log/Classes/Backend/FileBackend.php
#	Neos.Flow/Classes/Http/Cookie.php
#	Neos.Flow/Classes/Http/Headers.php
#	Neos.Flow/Classes/Mvc/Controller/Arguments.php
#	Neos.Flow/Classes/Persistence/Doctrine/QueryResult.php
#	Neos.Flow/Classes/Reflection/ClassReflection.php
#	Neos.Flow/Classes/Reflection/MethodReflection.php
#	Neos.Flow/Classes/Reflection/ParameterReflection.php
#	Neos.Flow/Classes/Reflection/PropertyReflection.php
#	Neos.Flow/Classes/Validation/Validator/AbstractCompositeValidator.php
#	Neos.Flow/Documentation/TheDefinitiveGuide/PartV/AnnotationReference.rst
#	Neos.Flow/Documentation/TheDefinitiveGuide/PartV/CommandReference.rst
#	Neos.Flow/Documentation/TheDefinitiveGuide/PartV/SignalsReference.rst
#	Neos.Flow/Documentation/TheDefinitiveGuide/PartV/TypeConverterReference.rst
#	Neos.Flow/Documentation/TheDefinitiveGuide/PartV/ValidatorReference.rst
#	Neos.Flow/Tests/Unit/Mvc/Controller/ActionControllerTest.php
#	Neos.Flow/Tests/Unit/Property/TypeConverter/DateTimeConverterTest.php
#	Neos.Flow/composer.json
#	Neos.FluidAdaptor/Tests/Unit/Core/Widget/AbstractWidgetControllerTest.php
#	Neos.FluidAdaptor/Tests/Unit/ViewHelpers/FormViewHelperTest.php
#	Neos.FluidAdaptor/composer.json
#	Neos.Kickstarter/composer.json
#	Neos.Utility.Arrays/Classes/Arrays.php
#	Neos.Utility.ObjectHandling/Classes/TypeHandling.php
#	Neos.Utility.ObjectHandling/Tests/Unit/Fixture/ArrayAccessClass.php
#	Neos.Utility.Unicode/Classes/TextIterator.php
#	psalm-baseline.xml

Classes/Files.php

@@ -320,7 +320,7 @@ public static function copyDirectoryRecursively(string $sourceDirectory, string
      * @return mixed The file content as a string or false if the file could not be opened.
      * @api
      */
-    public static function getFileContents(string $pathAndFilename, int $flags = 0, $context = null, int $offset = null, int $maximumLength = -1)
+    public static function getFileContents(string $pathAndFilename, int $flags = 0, $context = null, int $offset = 0, int $maximumLength = -1)
     {
         if ($flags === true) {
             $flags = FILE_USE_INCLUDE_PATH;