inventory extension!

you can now expand your inventory by using levels for the upgrades!

costs per upgrade:

1. upgrade: 20 lvl
2. upgrade: 30 lvl
3. upgrade: 40 lvl
4. upgrade: 50 lvl
5. upgrade: 60 lvl
6. upgrade: 70 lvl

every upgrade expands your inventory by 3 slots.

you can adjust the prices as well as dark, or white mode in the mod menu.

(the dark mode is build fot the "unique dark" recoursepack)

if you need any help, want changes, need a backport, or find a bug please dm me.