Fixed IE scrollbar issues for most if not all components

Fixed IE scrollbar issues for most if not all components

Fixed by defining font-size:0 and line-height:normal for all v-scrollable elements. A font-size is defined using $font-size for all themes and this is reset in v-widget. Similarly for $line-height.
Should fix at least #9004, #9552, #9572

Change-Id: I78da2c2ce497a0a22962644c9c97df5a0e41e056