Make the voice recording controls work with a screen reader

[mehranlatifi83]

Summary

While a voice message is being recorded, the controls are drawn on a canvas rather than laid out, and what stands for them to a screen reader is incomplete: the stop button is only found by touch and never by swiping, the recorded time is not reported at all, and activating any of them does nothing, since the handler behind them returns without doing the action.

This change:

• Reports the stop button along with send and cancel, so all of them are reached by swiping as well as by touch.
• Carries out what each of them stands for, where it is drawn, so they work when they are activated.
• Reports the recorded time when a screen reader asks for it, rather than telling it as it runs, which would talk over everything else while recording.
• Reports the recorded message that is left once recording stops: how long it is, and playing and pausing it from where it is read.
• Reports the two handles that trim that recording, which can then be moved a second at a time, so the recording can be cut without dragging them.

Nothing changes visually, and the controls keep working by touch exactly as before.