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The `hasMore` property of timelines in redux store was set whenever an API
request returned only one page of results, *even* if the query only requested
newer statuses (using `since_id`), causing `hasMore` to be incorrectly set to
false whenever fetching new toots in a timeline, which happens each time
an account's timeline or media gallery is visited.

Display “load more” more consistently, add a loading indicator on first load.

(Even though that codepath is probably never actually used…)

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- Move componentWillMount and componentWillReceiveProps logic to
  getDerivedStateFromProps.
- Compute CW auto-unfold status earlier

Fixes #832

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Fixes #819

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