Suggest an emoji in addition to the 3 suggested words when the
current word matches an alias in the emoji dictionary, if
available.

The font size of the suggested words is reduced if the word would
otherwise split on two lines.

* Refactor: Create subpackage 'suggestions'

* Candidates view: Status message when no dictionary installed

Show a message on the candidates view instead of leaving it empty. A
button points to the dictionary installation activity.

* Add an option to disable the suggestions

* Refactor: Remove Config.should_show_candidates_view

This was moved to EditorConfig.

* Don't disable text suggestions in some text boxes

* Suggestion text size matching settings

The candidates view height is based on the height of keyboard rows and
the suggestion text size is based on the size of labels on the keys.

This is influenced by symbol size and keyboard height options.

The `CandidatesView` is implemented as a `LinearLayout` that is divided
horizontally with up to 3 `TextView`. It might in the future contain
buttons on the sides.

The candidate view is nested into the input view rather than using
Android's `setCandidatesView` and callbacks as the API is unreliable and
complicated.

The first suggestion goes in the middle to be more accessible. The
second suggestion goes on the right to be more accessible to the
right-handed, because it must go somewhere.

Add a "Theme" option to choose between a dark and light theme.
The light theme uses the colors of the dark theme with the luminance
inversed.

The reloading after a configuration change is changed slightly:
- Special handling is needed when the Theme is changed (recreate the views)
- The default implementation of 'onConfigurationChanged' is used
  Which triggers more refresh (but don't recreate the views)
- 'onCreateInputView' is no longer needed

Themes replace 'colors.xml' and soon will replace 'dimens.xml'.

Use xmllint.
Re-indent Java files using spaces.