Updated CSS classes and rules for CE, which for the most part uses native elements
Also:
- Simplified ve.ce.Surface.getLeafNode, which may be better to just be removed and be used inline in the few places it's being used.
- Removed method wrapper for static function ve.ce.Surface.getLeafNode
Change-Id: I1d4cf0bb7ecc8f07f030753e40a13ebef7d02daa