files: Create files from template API

apps/files/appinfo/routes.php

apps/files/composer/composer/autoload_classmap.php

apps/files/composer/composer/autoload_static.php

apps/files/lib/Controller/TemplateController.php

apps/files/lib/Controller/ViewController.php

apps/files/tests/Controller/ViewControllerTest.php

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/Files/Template/TemplateManager.php

lib/private/Server.php

lib/private/legacy/OC_Util.php

lib/public/Files/Template/CreatedFromTemplateEvent.php

lib/public/Files/Template/ICustomTemplateProvider.php

lib/public/Files/Template/ITemplateManager.php

lib/public/Files/Template/Template.php

lib/public/Files/Template/TemplateFileCreator.php