Start groundwork for Dart Explorer.
Refactor code into its own component.
Predefined search, viewing results.
Turn off Dart Explorer in master
Change ID structure.

The analysis server also uses incrementing integers as their IDs.
Only show 20 items at a time in autocomplete

This improves autocomplete rendering performance considerably.
Show short message.
Increase width of autocomplete.
Merge branch 'master' into autocomplete
Update content before trying to autocomplete.
Move to AnalysisAPI-based implementation
Some refactoring of Autocomplete Component.
Update CHANGELOG.md
Autocomplete is aware of progress updates.
Show fetching results message until done.