I added the UI interface for player customization.

Currently this screen is only accessible from the pause screen, but in the future I will incorporate it into the gameplay so the player customize the character at specific locations throughout the world.

I also fixed some issues with how the UI menus were structured. I made every screen into a unity Canvas Group. I also fixed some bugs where the player could get stuck in certain menu screens.

Last but not least I added a new upward attack animation for the player, though I still need to implement the functionality.