Allow us to pass other Popper.js configurations to dropdowns and tooltips

Created by: istratos

Popper.js provides a lot of configuration that can be used for our utilities, but most of them are not being used by the plugins themselves.

I'm in a situation where I require a dropdown to be of fixed position rather than absolute, popper allows this via:

Popper.Defaults.positionFixed = true

However that would change everything that is using Popper in my page. I can't really change this configuration per-element basis.

It would be of great help to let us pass a second param to the built in functions, being the Popper options (not supported in the plugin) to be merged in the Popper config when initializing an object.

$('.dropdown-toggle').dropdown({
    boundary:'viewport' // Plugin config
}, {
    positionFixed: true // Popper config
});