* 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.

* Construct a single handler

* Add a delay after a Keyevent key in a macro

Add a delay before sending the next key to avoid race conditions causing
keys to be handled in the wrong order. Notably, KeyEvent keys handling
is scheduled differently than the other edit functions.

Add "macro" keys that behave as if a sequence of keys is typed.

Macro can be added to custom layouts or through the "Add keys to the
keyboard option". The syntax is:

    symbol:key1,key2,..

The symbol cannot contain a : character. 'key1', 'key2', etc.. are:

  - 'String with \' escaping'
    The key will generate the specified string.
  - keyevent:123
    The key will send a keyevent.
  - The name of any special key

The initial capitalisation state given by the editor
(`info.initialCapsMode`) is always 0 in many editors.

For some text input types, update the state when typing starts,
disregarding the value given by `info.initialCapsMode`.

Automatic capitalisation might interferes with keyboard shortcuts.

Remove the code dealing with InputMethodConnection from 'Keyboard2' and
move it into 'KeyEventHandler', where more editing actions can now be
implemented.

Autocapitalisation is also moved, the IReceiver interface is simplified.

Autocapitalisation could trigger while repeatedly typing Ctrl+Del to
remove several words.