Added showSelectionShape and cursor, as options to set the Bottom Navy Bar

Hi, Pedro 👋🏻

I added two new properties to the Bottom Navy Bar Widget:

showSelectionShape: Defaults to true. Its function is to give the option to disable the highlight color shape.
cursor: Defaults to clickable cursor. Its function is to change the cursor of the items hover. This is mainly for the web hover.

Please, check the changes, and tell me what do you think. I hope my contribution will be useful.

Regards, Alejandro Ramos...

💙

pedromassango / bottom_navy_bar