Add checkbox selection type for abilities

[LucasLavallee]

No description provided.

[JeffBeltran]

Thanks for the PR @LucasLavallee, if you update the readme with the changes i'll be happy to get this merged

[LucasLavallee]

Hi ! I just updated the Readme :). I also make a fix to make sure that available abilities are always visible even after canceling or closing the creation modal.

[JeffBeltran]

Thanks @LucasLavallee i'll take a look at this over the next few days and get it merged. Thanks for your contribution

[JeffBeltran]

hey @LucasLavallee just wanted to let you know that im still looking at this, i think i want to make a few slight changes but overall i think this is a nice feature. I like the idea of selecting from pre-made abilities and i wanted to give options to be text based (current), checkboxes (like this) and also a multiselect. but i'll want to think on this API before i merge this