DefaultTimeline: Add get_function function
DefaultTimeline: use the timeline's correct function

... not always that of the home timeline
TweetUtils: Align parameter names of work_array
Timelines: Update max_id upon new tweet arrival
DefaultTimeline: Set the MLE's state to loading when loading.
FavoritesTimeline: Add new favorites when event arrives

More or less copied from MentionsTimeline
FavoritesTimeline: Fix auto scrolling

Should always happen if the setting is turned on and we are scrolled up
already.
MissingListEntry: Set default value of lower_id
DefaultTimeline: Set error state of MLE when loading fails
DefaultTimeline: Only trim user and exclude entities if necessary
DefaultTimeline: Also set MLE to error state if parsing fails
Implement proper tweet loading after resume