OSX ctrl drag node to clone does not work because of OSX behaviour limitations

[GistCode]

Minimal reproduction of the bug/regression with instructions:

CTRL + Drag node on osx, results in 'right click'

Expected behavior:

Ctrl + drag will clone a node

Versions of Angular Tree Component, Angular, Node, affected browser(s) and operating system(s):

Other information:

I would be willing to submit a PR to fix this issue

[X] Yes (Assistance will be provided if you need help to submit a pull request) [ ] No