UI and visual improvements

I mainly focused on UI improvements this week, with the integration of context cinematic, a menu overhaul (ugly but fully fonctionnal :) and improvement on the spell selection/cast system, with heavy drawing from mmorpgs. I'm still working only with placeholder art but I wanted to try to show how I would like the benthic rift to look like (some sort of dimensional rifts caused by orichalcum ore) and i'm happy with the (work in progress) result :)