Merge discourse-links-category into Discourse

https://meta.discourse.org/t/links-category-for-discourse/43532

Links category is going to be a core feature. Links category offers the ability to post a link instead of text as well as displaying the link in the topic list. I’ll work together with the team for all its features. All features shall be working as original after the transition.

It adds an option in the category settings to be enabled. It stores links in the topic’s custom fields. A customized composer which shows only a small input field instead of original one is used to post link topics. The digest email template is also overrided for displaying url.

The implementation of plugins overrides many spots of core model which looks quite awkward to merge directly. I believe another archetype is much promising to try in the new implementation as described here. But that should result in a lot of changes in composer model and post creator. I’d like to know whether it’s the right path to go. @team

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