Fixed normal bug EXT-4648 (Right segment of Speak button is disabled if nearby voice chat is disabled in estate).

- Added methods for separate enabling of left and right parts of speak button and used them instead of simply enabling/disabling LLSpeakButton in bottomtray.

- Made changes to reset() in LLCallFloater to show "no one near..." instead of "loading" in vcp for nearby chat in regions with disabled voice.

--HG--
branch : product-engine