custom shape of indicator and control next and prev buttons

[briouyaasmae]

I suggest:
Add the possibility to customize the indicators

• shape so we can add radius
• change border color

Add controllers next and previous button will be great
Customize the visualization of the description of the image. I mean to be widget and not string

Thanks for the plugin, I find it more useful than similars but I preferred if I had a hand on more functionalities.