Merge branch message:8.x-1.x into 3371516-message-is-showing

.gitlab-ci.yml

.travis.yml

config/optional/views.view.message.yml

config/schema/message.schema.yml

drupalci.yml

message.api.php

message.info.yml

message.install

message.module

.../config/optional/message.template.example_create_node.yml

modules/message_example/message_example.info.yml

modules/message_example/message_example.module

phpcs-ruleset.xml.dist

phpcs.xml

src/Entity/Message.php

src/Entity/MessageTemplate.php

src/Form/MessageSettingsForm.php

src/Form/MessageTemplateDeleteConfirm.php

src/Form/MessageTemplateForm.php

src/FormElement/MessageTemplateMultipleTextField.php