Add a `TalkCollection` which extends Laravel/Tighten's, and add a method
there for getting the events from the talks. This makes this logic more
reusable and also makes the code in the `TalkCounter` service simpler.
- Rename `opdavies_blog` to `blog`.
- Rename `opdavies_blog_test` to `blog_test`.
- Rename `opdavies_talks` to `talks`.
- Rename `opdavies_talks_test` to `talks_test`.
The files within the directories haven't changed, so there is no
breaking change caused by renaming the directories.
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