EXT-8010 ADDITIONAL FIX Fixed problems with avatar links underlining.

There were two problems:

1. Underlining broke when avatar's first and second name were on different lines.
2. There was no underline on hover for avatar miniinspector links in plaintext IM.

- First problem was caused by calling LLOnHoverChangeableTextSegment::draw() for the same segment twice- for first and second name that were
on different lines, while handleHover() was called only once. So handleHover() was called -> text was underlined -> first part of segment was
drawn underlined -> its draw set style back to normal -> second part of segment was drawn without underlining.

Fixed this by setting style back to normal only when drawing the last part of the segment.

- Second problem was caused by unusual way of appending link to text in chat history.

Changed it so that LLTextBase::appendText() now receives link not inside style params, but directly.
Also added "/inspect" ending to check in LLUrlEntryAgent::underlineOnHoverOnly().

Reviewed by Richard Nelson at https://codereview.productengine.com/secondlife/r/833/

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branch : product-engine