only add LLScrollContainers to text widgets when requested, saving on LLTextBox construction time

combined clip and scroll attributes of text editors and text boxes...if you want to clip text, you need to introduce a scrollbar
moved clear to LLTextEditor so that text boxes won't empty out when calling LLPanel::clearCtrls()
EXT-1354 - added optional wrapping to LLTooltips...inspector tooltips don't wrap, everything else does
added LLFastTimer::reset call on application init to prime timers for pre-login timing
fixed tooltips positioning incorrectly due to mis-sized tooltipview
eliminated hide_scrollbar param for text editors

reviewed by Leyla