support up to 3 buttons in the admin button

[asirota]

support 3 installation variables that allow to add buttons to the admin menu

the text should be customizable
the link should be customizable

the order of the links is dictated by the name of the install script variable (adminbar-button1name, adminbar-button1link for example goes before adminbar-button2name, adminbar-button2link)

[mDisna]

This has been added - it will add as many links as you like, in the order entered. They will appear after the "EZ Designer" button and before the "Admin View" button.

Usage is as such:

ezAdminLink.push(["First Link", "https://example.com"]);
ezAdminLink.push(["Second Link", "https://example.com"]);
ezAdminLink.push(["Third Link", "https://example.com"]);

or

ezAdminLink.push(
  ["First Link", "https://example.com"],
  ["Second Link", "https://example.com"],
  ["Third Link", "https://example.com"],
);