Issue #2203411 by dawehner, Wim Leers, damiankloip: Convert drupal_get_library() into a service.

core/core.services.yml

core/includes/common.inc

.../Asset/Exception/IncompleteLibraryDefinitionException.php

...upal/Core/Asset/Exception/InvalidLibraryFileException.php

core/lib/Drupal/Core/Asset/LibraryDiscovery.php

core/lib/Drupal/Core/Asset/LibraryDiscoveryInterface.php

.../system/lib/Drupal/system/Tests/Common/JavaScriptTest.php

core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryTest.php

...re/Asset/library_test_files/css_js_settings.libraries.yml

...s/Core/Asset/library_test_files/css_weights.libraries.yml

...ts/Core/Asset/library_test_files/data_types.libraries.yml

.../Core/Asset/library_test_files/dependencies.libraries.yml

...ore/Asset/library_test_files/example_module.libraries.yml

...st_files/example_module_missing_information.libraries.yml

...Core/Asset/library_test_files/example_theme.libraries.yml

...ests/Core/Asset/library_test_files/external.libraries.yml

.../Core/Asset/library_test_files/invalid_file.libraries.yml

...Asset/library_test_files/js_positive_weight.libraries.yml