Clickable Highlight

[safiyu]

collapse and expand on clicking the label
Added new icons which is free for personal and commercial use.

[eu81273]

Hello safiyu :)
The first version of this tree menu directive (not opened) was developed like the way you suggested. But most tree menu libraries are not adapted that way. This is the why I developed like now.. So I think it's very difficult to merge your pull request. I'm so sorry..