fixed EXT-5842 There is a lot of unused space in the online/offline toasts,

- decreased on/offline notification toasts width from 305 to 220px;
- added toast right alignment;
- made toasts for long avatar names taller
(according to max length of avatar full name(63 characters) made 3 max line of message text in online/offline toasts, also corrected initial geometry parameters of panel_online_status_toast.xml to allow method LLToastPanel::snapToMessageHeigh works correctly);

reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/182/

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branch : product-engine