Merge branch '8.x-3.x' into feature/config-defaults

Conflicts:
	src/Engine/ExpressionPluginManager.php
	src/Engine/RulesExpressionTrait.php
	src/Plugin/RulesExpression/ActionSet.php
	src/Plugin/RulesExpression/Rule.php
	src/Tests/ConfigEntityTest.php
	tests/src/Integration/RulesIntegrationTestBase.php