Issue #2458763 by Wim Leers, m1r1k: Remove the ability to configure a block's cache max-age

core/config/schema/core.data_types.schema.yml

core/lib/Drupal/Core/Block/BlockBase.php

core/modules/block/block.install

core/modules/block/src/Tests/BlockCacheTest.php

core/modules/block/src/Tests/BlockInterfaceTest.php

core/modules/block/src/Tests/BlockStorageUnitTest.php

...ts/modules/block_test/src/Plugin/Block/TestCacheBlock.php

core/modules/node/src/Plugin/Block/SyndicateBlock.php

core/modules/simpletest/src/WebTestBase.php

core/modules/system/src/Plugin/Block/SystemMainBlock.php

core/modules/system/src/Plugin/Block/SystemMessagesBlock.php

.../modules/system/src/Plugin/Block/SystemPoweredByBlock.php

core/modules/system/src/Tests/Ajax/AjaxFormCacheTest.php

core/modules/system/system.install

.../modules/views/src/Tests/Plugin/BlockDependenciesTest.php