Move the implementation of each system functionality to a separate
package, so it is easier to integrate them in other flavours.

Set up the connection to the Huawei Speech Recognition service.

The voice button on the phone UI will perform a search if the user
is not currently writing on a text field (and therefore the keyboard
is not visible).

When the keyboard is visible, the voice button will capture text which
will be entered into the text field that the user is editing.