Adding support for toast.showWithOptions

[brickpop]

Version 2.4 of cordovaplugin-x-toast allows to provide styling for the toast messages.

  window.plugins.toast.showWithOptions({
    message: "hey there",
    duration: "short", // 2000 ms
    position: "bottom",
    styling: {
      opacity: 0.75, // 0.0 (transparent) to 1.0 (opaque). Default 0.8
      backgroundColor: '#FF0000', // make sure you use #RRGGBB. Default #333333
      textColor: '#FFFF00', // Ditto. Default #FFFFFF
      textSize: 20.5, // Default is approx. 13.
      cornerRadius: 16, // minimum is 0 (square). iOS default 20, Android default 100
      horizontalPadding: 20, // iOS default 16, Android default 50
      verticalPadding: 16 // iOS default 12, Android default 30
    }
  });

Also, the cordova plugin name is updated and some control code is added to prevent runtime errors if the plugin is not yet installed.
Thank you!

[gortok]

This should be put in dev-next branch; which I believe already has this PR.

[gortok]

I love some of these changes; so if you target the dev-next branch and you pull the latest from it to do your additions off of, I'd be happy to add it.

[gortok]

Please base this off of dev-next.