Inventory submenu is really coming along.

I added a singleton for the inventory because it is easier instead of typing PlayerController.player.inventory all the time.

It is possible to discard items but only one at a time, I want to implement a long button press to discard a whole stack.

Next up is applying effects to weapons and armor and mixing ingredients

changes:
https://github.com/Papiertig0r/Alchemy/commit/b8255c36f3a3086301048330e5143a50731f7486

Today I refactored the state machine, it is smoother and inputs are now where they belong (except for the normal world state... yet)

Also, I added some more functionality for the inventory submenu, but it's not quite ready yet :)

no visual changes, so no gif.

see changes here:
https://github.com/Papiertig0r/Alchemy/commit/6e4bd9d5fa746882978922cfd8e7c4c7ebc5f4b3