finished with EXT-2753 - Implement Avatar icons on IM multifloater tabs

add floater flashing, fix group icon sizes, fix click,some code cleanup, ect.
also I remove mIconCtrlWidth/Height since its kinda useless - mIconCtrlPad do the same thing...
IconSize will be btn_height-2*mIconCtrlPad - simple and good enough.

--HG--
branch : product-engine