BHV-5887: Expose highlight/unhighlight functions for Spotlight muter.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-5887: Update boolean var name that suppresses mute check when highlighting.
Merge pull request #126 from enyojs/BHV-5887-aarontam

BHV-5887: Expose highlight/unhighlight functions for Spotlight muter.