Primeng: ContextMenu - enable left click listener

[miresk]

I'm submitting a ... (check one with "x")

[ ] bug report => Search github for a similar issue or PR before submitting
[x ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Current behavior
Currently it is possible to open context menu only with a right click

Expected behavior
We should be able to open context menu also on left click. I suggest using some property like leftClick="true" or something similar that would allow us to do that.

• Angular version:
  4.2.2

• PrimeNG version:
  4.1.0-rc.2

[cagataycivici]

Sounds good.

[Nawsen]

I think it would be better if it supported any event the user wants to use.

[cagataycivici]

PR merged.