Button function customization

[rica-carv]

Motivation and Context

Added customization to enable tooltips on buttons and custom classes inside the dropdown lists

Description

Added the support to tags attributes

How Has This Been Tested?

Tested in latest github code

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist

• My code adheres to the e107 code style standard.
• I have read the contributing document.
• I have added tests to cover my changes.
• All new and existing tests pass.

[rica-carv]

Personally i think this function could benefit from using templates, since it would give the flexibility to be rendered as one of the three possible HTML tags, as stated in the BS docs, with the same styling plugin wide or theme wide...

Probably the overhead of adding a template parsing to this function is too much...
What would be better?

• Have multiple calls to the function as it is right now with all the default styling classes, etc, scattered in a plugin/theme hardcoded in the PHP code, and hard to customize everytime i call the function?
  Imagine a theme designer change all this code in a theme....
• Or have the HTML styled in single location easy to customize in my plugin/theme in a template?

But it's just my thougths.