The width of the navigation was not accounted correctly.

This reverts be8a99bd

* Refactor: KeyValue constants

Add constants for keys that are accessed from the app's code. This
simplifies the fake pointer handling in Keyboard2View.

* Refactor: Pre-compute action key replacement

The action key and the enter swap are pre-computed in EditorConfig. This
simplifies the code.

The color of labels on a pressed key that were not the label being
activated (eg. the labels on the corners when activating the label in
the centre) was not correct.

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.

* Disable selection mode in text editors

Selection mode removes the space bar key (which is replaced by the Esc
key) and can be annoying in Emacs for example.
Text editor users probably have the `esc` key available.

* Refactor: Move EditorInfo related code to EditorConfig

Add the new EditorConfig class that handles configuration extracted from
the EditorInfo. It is accessible from the Config class for convenience.

This aims at reducing the length of already large classes and group the
code that was spread over several classes.

The label size was computed against the width of keys on the keyboard,
which resulted in a different label size on different layouts.
Notably, it made the labels very small on a 11 columns layout and
relatively larger on the numpad.

The label size is now computed against a baseline of 1/10 of the width
of the screen.

* Fix extra bottom margin when navbar buttons absent

Fix the extra space that was appearing when the gesture-navigation bar
didn't contain the "switch IME" or "close IME" buttons.
This was found on OneUI 7 with the two "keyboard key" related options
turned off.

* Remove unneeded nav bar detection and width computation