1105231 - [Stingray][System] contextmenu visual

This bug did the following 
- Apply visual style to context menu under smart-system
- Put shared icons under `tv_shared/style/icons/` and make a dummy `icon.css`.
- Copy subdirectory to each included css file under `tv_shared/style`

We need to exchange svg to ttf after it's finished.

We should not use svg here. The svg is a hint to find the icon-font. Please use icon-font instead.