Registering of BreadcrumbGenerators should be easier

[TomasLudvik]

What is happening

If you want to register new BreadcrumbGenerators, you need to override BreadcrumbResolverFactory.

Expected result

There should be some tag that would say, that this service is BreadcrumbGenerator and then it should be automatically registered. Same as it is in case of shopsys.friendly_url_provider.

Better way would be to tag services automatically by their classes interfaces:

• all classes implementing FriendlyUrlDataProviderInterface should be automatically tagged by shopsys.friendly_url_provider
• all classes implementing BreadcrumbGeneratorInterface should be automatically tagged by shopsys.breadcrumb_generator.

[boris-brtan]

#1176 closes #919 #1090 #1111

https://help.github.com/en/articles/closing-issues-using-keywords
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